WO2010050143A1

WO2010050143A1 - Information recording medium, recording device and reproducing device

Info

Publication number: WO2010050143A1
Application number: PCT/JP2009/005457
Authority: WO
Inventors: 中村敦史; 宮川直康; 古宮成; 日野泰守; 伊藤基志; 東海林衛; 高橋宜久
Original assignee: パナソニック株式会社
Priority date: 2008-10-27
Filing date: 2009-10-19
Publication date: 2010-05-06
Also published as: JP2013218782A; EP2341500A4; TW201025308A; RU2010154076A; BRPI0914938A2; RU2511708C2; EP2341500A1; US20110096643A1; JPWO2010050143A1; MX2010013194A; CN102077281A; KR20110074956A

Abstract

An information recording medium is provided with three or more information recording layers. Each of the information recording layers is provided with a test recording region to be used for adjusting recording conditions. One information recording layer among the information recording layers is provided with a management data region, which has management data for managing the information recording medium previously recorded thereon and is to be exclusively used for reproduction, and such information recording layer is also provided with a data-recordable management data region on which management data for managing the information recording medium can be newly written. Each of other two or more recording layers among the information recording layers is provided with a test recording region having the radius position thereof overlap that of a part of the management data region exclusively used for reproduction. On the recording layer provided with the data-recordable management data region, two data-recordable management data regions are arranged on the inner circumferential side and on the outer circumferential side of the test recording region, respectively.

Description

Information recording medium, recording apparatus and reproducing apparatus

The present invention relates to a multilayer optical information recording medium provided with a test recording area (OPC area) for obtaining optimum recording conditions (recording power and / or write strategy) for a plurality of information recording layers, and multilayer optical information The present invention relates to a recording apparatus and a reproducing apparatus that perform recording and / or reproduction on a recording medium.

Conventionally, optical recording media include BD-R, BD-RE, DVD-RAM, DVD-R, DVD-RW, and CD-RW standards, and data is obtained by irradiating an optical disk conforming to these standards with laser light. There is a technique for recording / reproducing the video.

An example of these optical disks is an optical disk using a phase change type recording material as a recording layer. A phase change optical disk records information by irradiating an optical disk with a laser beam and locally changing the atomic bonding state of a thin film material formed on the surface of the recording film by the injection energy. Next, when a laser beam having a sufficiently lower power than that at the time of recording is irradiated, the reflectance changes due to the difference in the physical state described above. Information can be read by detecting the amount of change in reflectance.

As described above, the phase change type optical disc includes a rewritable optical disc using GeSbTe as the recording material of the recording layer and a write-once optical disc using another recording material. As an example of a recording material for a write-once optical disk, Patent Document 1 contains Te—OM (where M is at least one element selected from a metal element, a metalloid element, and a semiconductor element). There is a disclosure of a recording layer using a material. The recording material Te-OM is a material containing Te, O and M, and Te, Te-M and M fine particles are uniformly and randomly dispersed in the TeO2 matrix immediately after film formation. It is a composite material. When the thin film formed of this recording material is irradiated with the focused laser beam, the film is melted and Te or Te-M crystals having a large particle size are precipitated. The difference in the optical state at this time can be detected as a signal, which enables so-called write-once recording that can be written only once.

In addition, two thin films of different materials such as alloy-type write-once disks made of an inorganic material are stacked and heated and melted with a laser to mix and alloy them to form a recording mark, or It seems that the organic dye is thermally decomposed by the temperature rise of the organic dye-based material by laser irradiation, the change in the refractive index of the pyrolyzed portion is reduced, and the path length of the light transmission layer is shortened compared to the unrecorded portion. There is a write-once type optical disc or the like that records information by appearing like an uneven pit such as a read-only CD for incident light.

When mark edge recording is performed on these write once optical discs, a recording mark is formed by irradiating a laser beam modulated in a multi-pulse form to cause a change in the physical state of the recording material. Information is read by detecting a change in reflectance.

In recent years, the capacity of optical discs has been increasing. In order to increase the recording capacity of optical discs, the recording mark, space length and track pitch are shortened to increase the recording density per surface, and the information recording layer that can be written to or read from the laser light incident surface is multilayered. There is a way to increase the recording capacity.

As a method of increasing the recording capacity by increasing the number of layers, an information recording layer that is translucent to the laser beam is disposed on the information recording layer on the laser beam incident side (front side), and an information recording layer is disposed on the far side. There is a method of multilayering. An optical disc having a plurality of information recording layers needs to be recorded or reproduced in an appropriate state regardless of the recording state of the transmitted information recording layer in all laminated information recording layers. Ensuring is becoming increasingly important.

Therefore, in order to ensure reliability, an area for calibrating recording power, called a test recording area or “OPC (Optimum Power Control) area” in the inner area of the inner periphery of the optical disk or the outer area of the outer periphery. Is arranged. “OPC” is a laser pulse that is irradiated on an optical disc after performing test recording in order to calibrate power fluctuations caused by temperature change or the like on a recordable optical disc. This means a process of optimizing the power level (recording power learning), the timing and length of laser pulse generation (write strategy learning), and the like. That is, when an optical disc is loaded on a recording / reproducing apparatus (optical disc apparatus), the optical disc apparatus repeatedly performs test recording in an OPC area provided in the optical disc, and calculates an optimum recording power for the corresponding optical disc.

However, in the OPC area, in the process of learning the recording power, it is conceivable to record the test signal with an excessive recording power compared to a recording power appropriate for recording data. If test recording is performed in the OPC area of the previous information recording layer with excessive recording power, the transmitted laser light is affected by the recording state of the OPC area, and recording / reproduction of the information recording layer on the back side is performed. The signal quality is adversely affected. Specifically, there is a possibility that a deviation from the optimum recording power, a reproduction signal reading error, a tracking error signal or a focus error signal is distorted, and tracking or focus servo becomes unstable.

In order to solve these problems, techniques for improving the reliability of OPC have been proposed by devising the physical format and recording method of the OPC area of the multilayer optical disc (for example, Patent Document 2 to Patent Document 7). And Non-Patent Document 1).

JP 2004-362748 A JP 2005-38584 A International Publication No. 2002/023542 Pamphlet Special table 2007-521606 Special table 2007-526595 Special table 2007-521589 gazette Special table 2008-527602

When test recording is performed in the OPC area of the previous information recording layer with an excessive recording power, the transmitted laser beam is affected by the recording state of the OPC area, and the recording / reproduction signal quality of the information recording layer on the back side Patent Documents 2 to 7 are provided with at least two information recording layers for the purpose of preventing adverse effects on the recording medium, and each information recording layer includes an inner area, a data area, and an outer area. In addition, at least one OPC area is provided in at least one of the inner area and the outer area, and each of the plurality of information recording layers or each OPC area provided in the adjacent information recording layer has a light beam The physical format of the OPC area of a multilayer optical disc that is not provided at the same physical position with respect to the traveling direction is mainly disclosed.

However, when the OPC area is overlapped between odd or even information layers, the transmitted light is affected by the recording state of the previous information recording layer, and adversely affects the recording / reproduction signal quality of the information recording layer on the back side. End up. Even if an optical disc in which the presence or absence of recording in the front information layer does not affect the recording quality in the back information recording layer, if test recording is performed with excessive power in the OPC area of the front information recording layer, It is conceivable that when the laser beam passes through this information recording layer, it is affected by a change in intensity and the like, and in the back information recording layer, the optimum recording power cannot be derived by OPC.

On the other hand, when all the OPC areas are arranged so as not to overlap each other, the information recording layer is laminated in order to eliminate the overlap of the OPC areas at the same physical position with reference to the traveling direction of the light beam. As the number increases, it is necessary to reduce the physical size occupied by the OPC area per layer or increase the inner area or the outer area. In any of the methods, the number of OPCs has to be reduced, and the user data area for the user to record on the optical disk is reduced.

In particular, even if the OPC area is not overlapped with the adjacent information recording layer or all the information recording layers without increasing the inner area or the outer area, the physical area occupied by the OPC area as the number of information recording layers increases. The size (number of clusters) must be reduced. In particular, in an optical disk medium that can be recorded only once, such as a write-once optical disk, the number of times of learning the recording power and recording pulse conditions decreases due to the decrease in the physical size of the OPC area. Furthermore, there is a high possibility that the OPC area will be used up, and there is an increased possibility that test recording cannot be performed even though there is a space in the user data area and recording on the optical disk must be stopped.

In particular, in the case of an optical disc in which the recording density per side is simultaneously improved at the same time as multilayering (for example, in the case of a recording capacity of 33.4 GB or 32 GB per layer by filling the linear density with BD). , The size of the recording mark or space is sufficiently smaller than the spot size of the light spot, the intersymbol interference of the reproduction signal and the thermal interference between the recording marks increase, and the edge shift between the recording mark and the space is noticeably generated To do. When performing write strategy adjustment to correct these edge shifts, the number of test recordings must be increased more than before, and write strategy adjustment must be performed more accurately to improve recording signal quality. That is, in the physical format in which the test recording area in the inner area or the outer area is arranged so as not to overlap between the information recording layers as described above, the physical size of the test area of the information recording layer must be reduced, There is a problem that many test recording areas cannot be secured.

Also, the test recording area is required to have random accessibility so that the information recording layers can be used freely rather than sequentially.

In the case of an additionally writable or rewritable optical disc, the recording order of recording on each information recording layer is not necessarily completely sequential from the back information recording layer to the front information recording layer as L0 → L1 → L2 → L3. Instead of recording, it is necessary to record continuously in a united section of each information recording layer and freely record between information recording layers. Defect management and file system management will be described as an example where it is necessary to record freely between information recording layers.

In the optical disc of the present invention, areas called data spare areas (alternate areas) for saving data are defined on the inner and outer circumferences of areas where user data is recorded. They are called ISA (Inner Spare Area) and OSA (Outer Spare Area), respectively. In the defect management, when the optical disk apparatus cannot record data for some reason during data recording, the optical disk apparatus records data that is scheduled to be recorded in a block that cannot be recorded in an unused area in the replacement area. Next, pairs of addresses of replacement sources (defective blocks) and replacement destinations (replacement areas) are registered in a list that manages replacement information called defect lists as replacement information. The defect list is secured in the DMA in the inner zone or the outer zone. At the time of playback, the optical disk device reads the information registered in the defect list. If it is not registered, it reads the data from the specified location, and if it is registered, it actually reads the information based on the replacement information. Read data from where it is written.

In the defect management system described above, since the file system manages logical address information, replacement processing that reflects the physical structure may not be performed. That is, when data is being recorded in the user data area of L0 and a replacement process occurs and the spare area of L0 is full, writing to the unrecorded spare area of the information recording layer other than L0 is performed. Can happen. As described above, the recording order between the information recording layers may physically be performed across the information recording layers.

Also, when managing the file system, which is a mechanism for managing information in the disk, when the logical address start address and end address and the physical address start address and end address are made to correspond sequentially, the start side of the logical address In the case of a file system in which information is recorded in order and management information is recorded from the end side of the logical address, it is assumed that an instruction is issued from the host to record data on the end address side. The end address of the logical address is the L3 information recording layer in which the physical end address of the optical disk is arranged. Therefore, the recording order between the information recording layers is physically recorded across the information recording layers.

Therefore, the optimization of the recording power in the OPC area not only sequentially performs the OPC of the information recording layer on the front side in order from the back layer, but also the optimum recording power, recording pulse condition and servo for all the information recording layers. It is necessary to optimize the conditions in advance.

The present invention has been made in view of the above problems, and while realizing that the test recording in the OPC area of one information recording layer minimizes the influence on the OPC area of another information recording layer, An object of the present invention is to provide an information recording medium in which an OPC area is efficiently arranged in an inner area and / or an outer area, and a recording apparatus and a reproducing apparatus corresponding to the information recording medium.

The information recording medium of the present invention is an information recording medium comprising a plurality of information recording layers of three or more layers, and each of the plurality of information recording layers has a test recording area used for adjusting recording conditions. One information recording layer of the plurality of information recording layers includes a read-only management data area in which management data for managing the information recording medium is recorded in advance. Each of the other two or more information recording layers includes the test recording area where a radial position overlaps a part of the management data area.

The reproducing apparatus according to the present invention is a reproducing apparatus for reproducing information recorded on the information recording medium, the irradiation unit irradiating the plurality of information recording layers with laser light, and the irradiation of the irradiated laser light. A light receiving unit that receives reflected light and a reproduction unit that reproduces information based on a signal obtained by the light reception.

The recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, wherein the recording condition is set using an irradiation unit for irradiating the plurality of information recording layers with laser light and the test recording area. And a recording unit for recording information on the information recording medium under the adjusted recording condition.

The information recording medium of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers manages the information recording medium. Management data area in which management data for recording is recorded in advance, and each of the other two or more information recording layers of the plurality of information recording layers has at least a part of the management data for playback only A write-inhibited area in which writing is prohibited in which the area and the radial position overlap is provided.

The recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, wherein the plurality of information recording layers are pre-recorded in an irradiation unit for irradiating the plurality of information recording layers and the reproduction-only management data area A recording unit that reproduces the management data and records information on the information recording medium based on the management data.

The information recording medium of the present invention is an information recording medium comprising a plurality of information recording layers of three or more layers, and each of the plurality of information recording layers has a test recording area used for adjusting recording conditions. One information recording layer of the plurality of information recording layers includes a recordable management data area in which management data for managing the information recording medium can be newly written, and a test recording area The recordable management data area is arranged on the inner and outer peripheral sides of the test recording area.

The information recording medium of the present invention is an information recording medium comprising a plurality of information recording layers of three or more layers, and at least two of the plurality of information recording layers manage the information recording medium A recordable management data area in which management data for writing can be newly written, and the recordable management data area of one information recording layer of the plurality of information recording layers, and at least one other At least some of the radial positions overlap each other with the recordable management data area of one information recording layer.

The recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, and is recorded in an irradiation unit for irradiating the plurality of information recording layers with laser light and the recordable management data area. And a recording unit that reproduces the management data and records information on the information recording medium based on the management data.

The information recording medium of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers manages the information recording medium. A plurality of recordable management data areas into which management data for writing can be newly written.

The information recording medium of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers manages the information recording medium. A plurality of recordable management data areas in which management data can be newly written, and a test recording area used for adjusting a recording condition is provided between the two recordable management data areas. Has been placed.

The information recording medium of the present invention is an information recording medium comprising a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers is used for adjusting recording conditions. The test recording area to be used, the first write-inhibited area in which writing is prohibited, arranged adjacent to the inner circumference side of the test recording area, and the outer circumference side of the test recording area are arranged , A second write prohibited area where writing is prohibited, a first area arranged adjacent to the inner periphery of the first write prohibited area, and adjacent to the outer periphery of the second write prohibited area The second area is arranged, and information of the same attribute is recorded in the first area and the second area.

The information recording medium of the present invention is an information recording medium comprising a plurality of information recording layers of three or more layers, and each of at least one information recording layer of the plurality of information recording layers adjusts recording conditions. First and second test recording areas used to perform the first test recording in the first test recording area, and after the first test recording, the second test recording area 2, the second test recording is performed based on the result of the first test recording, and the physical size of the second test recording area is larger than the physical size of the first test recording area.

Each of at least two information recording layers of the plurality of information recording layers includes the first and second test recording areas, and the test recording using the first test recording area includes the information recording layer. The recording may be performed in order from the information recording layer far from the laser light incident surface of the recording medium.

The recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, wherein the plurality of information recording layers are irradiated with a laser beam, and the first and second test recording areas And a recording unit that records information on the information recording medium under the adjusted recording condition.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and each of the plurality of information recording layers is used for adjusting a recording condition. A test recording area is provided. One information recording layer of the plurality of information recording layers includes a read-only management data area in which management data for managing the information recording medium is recorded in advance. Each of the other two or more information recording layers of the plurality of information recording layers includes the test recording area where a radial position overlaps a part of the management data area.

As described above, according to the present invention, a part of the read-only management data area (for example, PIC area) overlaps at least a part of the test recording area (for example, OPC area) of the other two or more information recording layers. Arrange so that. By placing the OPC area on top of the PIC area in a zone with a limited size, the size of the OPC area is kept large while minimizing the configuration in which the OPC areas are arranged at the same radial position. This can reduce the possibility of using up the OPC area. Since the same information is repeatedly recorded in the PIC area, even if those OPC areas are damaged by the laser beam, the information is surely received from the part of the PIC area that does not overlap the damaged OPC area. Can be read out.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers is the information recording medium. A reproduction-only management data area in which management data for managing the medium is recorded in advance is provided. Each of the other two or more information recording layers of the plurality of information recording layers has a write prohibited area where writing is prohibited, at least a part of which overlaps with the reproduction-only management data area. Prepare.

As described above, according to the present invention, the read-only management data area (for example, PIC area) and the write-inhibited area (for example, buffer area) of other layers are arranged so as to overlap each other. Since no writing operation is performed in the buffer area, the laser beam is not damaged. Therefore, information can be reliably read from the portion of the PIC area that overlaps the buffer area. If an area on another layer that overlaps a part of the PIC area (for example, the OPC area) is damaged, information may not be read from the corresponding part of the PIC area. However, even in that case, since the same information is repeatedly recorded in the PIC area, the information can be reliably read from the portion of the PIC area overlapping the buffer area. In the PIC area, disk management data of each information recording layer is recorded in units of blocks, and unit blocks are repeatedly recorded in the PIC area a plurality of times. Therefore, the disk management data in almost all areas of the PIC area may be damaged due to the influence of writing in the previous layer and become unreadable. That is, there is no problem as long as the disk management data of at least one block among a plurality of repeatedly recorded blocks can be read. The disk management data in the PIC area on the back side of the buffer areas L1 to L3 may be read without any problem. In other words, the PIC area is arranged on the back side of the L1 to L3 OPC area, and the buffer area is provided adjacent to the L1 to L3 OPC area so that the space in the lead-in zone can be efficiently reduced. It is possible to secure a sufficient OPC area for use.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and each of the plurality of information recording layers is used for adjusting a recording condition. A test recording area is provided. One information recording layer of the plurality of information recording layers includes a recordable management data area in which management data for managing the information recording medium can be newly written, and a test recording area. The recordable management data areas are arranged on the inner and outer peripheral sides of the test recording area.

As described above, according to the present invention, the management data area (for example, TDMA area) that can be recorded in one information recording layer is provided at two locations on the inner peripheral side and the outer peripheral side of the OPC area. It is possible to reduce or eliminate the amount of overlap between the OPC region and the layer between the OPC regions. In other words, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be overlapped with each other, but the recordable management data area is located on the inner circumference side. And the outer two are divided into two, and the size of the OPC area and the recordable management data area is both large while minimizing the configuration in which the OPC areas are arranged at the same radial position. be able to. This can reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and at least two information recording layers of the plurality of information recording layers include the information recording medium. A recordable management data area in which management data for managing the recording medium can be newly written is provided. The recordable management data area of one information recording layer of the plurality of information recording layers and the recordable management data area of at least one other information recording layer have at least some radial positions. Overlap each other.

As described above, according to the present invention, the management data area (for example, DMA (TDMA)) of a certain information recording layer and the management data area (for example, DMA (TDMA)) of another certain information recording layer are at least partially Are arranged so that their radial positions overlap each other. By arranging the DMAs (TDMAs) to overlap each other, a zone with a limited size can be used effectively. For example, by arranging both the OPC area and DMA (TDMA) of the information recording layer far from the laser irradiation surface and the DMA (TDMA) of the information recording layer close to the laser irradiation surface so that the radial positions overlap, The zone of the information recording layer on the near side can be used effectively. DMA (TDMA) is irradiated with laser light after power adjustment, and is not damaged by irradiating excessive recording power. Even if DMAs (TDMA) are overlapped, information recording on the back side Information recorded on the layer can be read normally. Moreover, even if the OPC area of the information recording layer far from the laser irradiation surface is damaged by the laser beam, there is no problem from the DMA (TDMA) of the information recording layer arranged on the side of the OPC area close to the laser irradiation surface. Information can be read out.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers is the information recording medium. A plurality of recordable management data areas into which management data for managing the medium can be newly written are provided.

As described above, according to the present invention, two management data areas (for example, TDMA areas) that can be recorded in one information recording layer are provided, so that the OPC areas between the other information recording layers are separated from each other. The amount of overlap between the layers can be reduced or eliminated. In other words, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be placed one on top of the other, but the two recordable management data areas are sandwiched between the OPC areas. By dividing and arranging the OPC areas at the same radial position, the size of the OPC area and the recordable management data area can be both large while minimizing the configuration. This can reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and one information recording layer of the plurality of information recording layers is the information recording medium. A plurality of recordable management data areas into which management data for managing the medium can be newly written are provided. Between the two recordable management data areas, a test recording area used for adjusting a recording condition is arranged.

As described above, according to the present invention, an OPC area is arranged between two management data areas (for example, DMA (TDMA)). Thereby, the OPC area can be arranged at a position away from the user data area. Also, with such a configuration, for example, the OPC region of the information recording layer far from the laser irradiation surface and the DMA (TDMA) of the information recording layer near the laser irradiation surface may overlap each other in radial position. In this case, even if the OPC region of the information recording layer far from the laser irradiation surface is damaged by the laser beam, information can be read out from the DMA (TDMA) of the information recording layer near the laser irradiation surface without any problem. .

Also, when the OPC area is arranged inside the DMA (TDMA), the remaining zone whose size is limited can be used effectively.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, wherein one information recording layer of the plurality of information recording layers has a recording condition. A test recording area used for adjustment, a first write-inhibited area in which writing is prohibited, arranged adjacent to the inner circumference side of the test recording area, and an outer circumference side of the test recording area. A second write prohibited area where writing is prohibited, a first area arranged adjacent to the inner periphery of the first write prohibited area, and a second write prohibited area And a second region disposed adjacent to the outer peripheral side. Information of the same attribute is recorded in the first area and the second area.

As described above, according to the present invention, when an OPC area is arranged between two DMAs (TDMA), a buffer area is arranged between the DMA (TDMA) and the OPC area. Thereby, even if the OPC area is damaged by the laser beam, it is possible to prevent the DMA (TDMA) from being affected. In addition, since information of the same attribute is recorded in two DMAs (TDMA), even if one DMA (TDMA) is damaged and cannot be read out, the information is surely received from the other DMA (TDMA). Can be read out.

In addition, by providing two management data areas (for example, TDMA areas) that can be recorded across an OPC area in one information recording layer, an OPC area between other OPC areas is provided between other OPC areas. Can be reduced or eliminated. That is, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be overlaid. On the other hand, the management data area that can be recorded across the OPC area is divided into two, and the OPC area and the OPC area can be recorded while minimizing the configuration in which the OPC areas are arranged at the same radial position. It is possible to secure a large size for both the management data area and reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

An information recording medium according to an embodiment of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and each of at least one information recording layer of the plurality of information recording layers includes: First and second test recording areas used for adjusting recording conditions are provided. The first test recording is performed in the first test recording area. After the first test recording, a second test recording based on a result of the first test recording is performed in the second test recording area. The physical size of the second test recording area is larger than the physical size of the first test recording area.

As described above, according to the present invention, the power of the laser beam is first adjusted using the first test recording area. After the power adjustment, recording parameters other than the power, such as a pulse waveform, are adjusted using the second test recording area. Since the second test recording area is used after the power adjustment, it is possible to prevent the second test recording area from being damaged. For this reason, since the second test recording areas can be arranged over the plurality of information recording layers so that their radial positions overlap each other, a zone having a limited size can be used effectively.

Further, according to the multilayer optical information recording medium, the recording method, the reproducing method, and the recording / reproducing apparatus for the multilayer optical information recording medium according to the present invention, a plurality of information recording layers in a multilayer optical disc having a plurality of information recording layers When the optimal recording power and write strategy are adjusted by performing test recording in the OPC area provided for each of the above, the accuracy is also achieved in the back information recording layer regardless of the recording state of the information recording layer located on the laser beam incident side. Recording power adjustment and write strategy adjustment are possible, and a highly reliable multilayer optical disc can be provided.

In addition, by devising the physical format layout of the test recording area, it is possible to increase the physical size of the OPC area of each information recording layer within the limited inner area or outer area, and to reduce the number of test recordings. Reliable recording power adjustment and write strategy adjustment are possible without reduction. Particularly, in the case of an optical disk medium that can be recorded only once, such as a write-once optical disk, there is no possibility that the OPC area will be used up at an early stage even though the user data area is empty, and test recording cannot be performed. Thus, it becomes possible to solve problems such as the inability to add to the optical disc.

As a result, a large-capacity and high-density multilayer optical information recording medium can be realized, and at the same time, high reliability of the information recording / reproducing apparatus can be realized.

It is a figure explaining the whole structure of the optical information recording / reproducing apparatus by embodiment of this invention. It is a figure explaining the cross section of the track layout of each layer of the four-layer optical disk by embodiment of this invention. It is a figure which shows an example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 1st Embodiment of this invention. It is a figure which shows an example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 2nd Embodiment of this invention. It is a figure which shows an example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 3rd Embodiment of this invention. It is a figure which shows an example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 4th Embodiment of this invention. It is a figure which shows an example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 5th Embodiment of this invention. 6 is a flowchart showing a procedure for performing test recording in a test recording area of a four-layer optical disc according to first to fourth embodiments of the present invention. It is a figure explaining the outline of the stack structure of the 4 layer optical disk by embodiment of this invention. It is a figure which shows the area | region structure on the plane of the multilayer optical disk medium by embodiment of this invention. It is a flowchart which shows the procedure at the time of carrying out test recording to the test recording area of the 4 layer optical disk by the 5th Embodiment of this invention. It is a figure which shows the schematic diagram of the reproduction | regeneration signal by Embodiment 8 of this invention. It is a figure explaining the relationship between the modulation degree with respect to the recording power and the product of power by Embodiment 8 of this invention. It is a figure explaining the use direction of the cluster of the OPC area | region by embodiment of this invention. It is another figure explaining the cross section of the track layout of each layer of the 4 layer optical disk by embodiment of this invention. It is a flowchart which shows the procedure at the time of optimizing the servo conditions of the 4 layer optical disk by the 9th Embodiment of this invention. It is a figure which shows another example of the physical format by which the OPC area | region is arrange | positioned in each information recording layer by the 5th Embodiment of this invention. (A) shows a write-once disc having two information recording layers according to an embodiment of the present invention, and (b) shows a rewritable disc having two information recording layers according to an embodiment of the present invention. It is a figure which shows the structural example of the multilayer disc by embodiment of this invention. It is a figure which shows the structural example of the single layer disc by embodiment of this invention. It is a figure which shows the structural example of the double layer disc by embodiment of this invention. It is a figure which shows the structural example of the three-layer disc by embodiment of this invention. It is a figure which shows the structural example of the four layer disc by embodiment of this invention. 1 is a diagram showing a physical configuration of an optical disc 1 according to an embodiment of the present invention. (A) is a figure which shows the example of 25GB BD by embodiment of this invention, (b) is a figure which shows the example of the optical disk of higher recording density than 25GB BD by embodiment of this invention. It is a figure which shows a mode that the light beam is irradiated to the mark row | line | column recorded on the track | truck by embodiment of this invention. It is a figure which shows the relationship between OTF and the shortest recording mark in the case of 25GB recording capacity by embodiment of this invention. It is a figure which shows the example which the spatial frequency of the shortest mark (2T) by embodiment of this invention is higher than an OTF cutoff frequency, and the amplitude of the reproduction signal of 2T is 0.

Hereinafter, preferred embodiments according to the multilayer optical information recording medium, the recording method, the reproducing method, and the recording / reproducing apparatus of the multilayer optical information recording medium of the present invention will be described in detail with reference to the drawings.

In the embodiment of the present invention, the case of a BD-R which is a write-once optical disc having four layers as a recording medium will be described as an example. However, this does not particularly limit the characteristics of the recording medium. Is a technique common to recording media for recording information by forming marks or pits having different physical properties from the unrecorded portion. Non-Patent Document 1 also discloses an outline of the physical format of the Blu-ray Disc (BD) in the present embodiment.

In addition, the information recording layer of a read-only optical disc in which a reflective film is formed on a substrate having uneven pits is combined with any one of an information recording layer of a write-once optical disc and an information recording layer of a rewritable optical disc. This technique is also common to so-called hybrid type multilayer optical information recording media.

The main optical conditions used in the optical disc, the optical disc recording method, the reproducing method and the recording / reproducing apparatus of the present invention are as follows. .84 to 0.86, specifically NA = 0.85. The physical structure of the optical disk medium is a multilayer optical disk in which information recording layers that can be recorded or read from the laser incident side are laminated in four layers with a track pitch of 0.32 μm, and the thickness from the laser incident surface to each information recording surface is A case will be described as an example in which recording is performed on the optical disc at 50 μm to 110 μm, the encoding method is 17PP modulation, and the shortest mark length (2T) is 0.112 μm to 0.124 μm, specifically 0.112 μm. When recording at a linear density at which the shortest mark length is 0.112 μm, the recording capacity per BD with a diameter of 12 cm corresponds to approximately 33.4 GB, and when this is stacked in three layers, approximately 100 GB and four layers are stacked. Corresponds to approximately 134 GB. Further, when recording is performed with a linear density at which the shortest mark length is 0.116 μm, the recording capacity per one surface of an optical disk having a diameter of 12 cm corresponds to approximately 32 GB, and when this is stacked in three layers, approximately 96 GB and four layers are stacked. This corresponds to approximately 128 GB. Further, when recording is performed with a linear density at which the shortest mark length is 0.124 μm, the recording capacity per surface of an optical disk having a diameter of 12 cm corresponds to approximately 30 GB, and when this is stacked in three layers, approximately 90 GB and four layers are stacked. This corresponds to approximately 120 GB.

The recording speed will be described by taking as an example a case where the recording rate is equivalent to a BD double speed with a channel rate of 132 MHz (Tw = 7.58 ns). The linear velocity is 7.38 m / sec.

However, the various parameters shown here (number of layers, layer thickness, recording density, recording capacity, recording speed, etc.) are merely examples, and are not particularly limited to these numerical values.

In the present invention, the “OPC (Optimum Power Control) area” refers to performing test recording (also referred to as OPC) in an inner zone provided in the inner peripheral portion of the recording medium or an outer zone provided in the outer peripheral portion. An area allocated for this purpose. “OPC (Optimum Power Control)” means a process of optimizing the recording power level of the laser beam irradiated on the optical disc during recording before recording data on the recordable optical disc. That is, when an optical disc is loaded on an optical recording / reproducing apparatus (optical disc apparatus), the optical disc apparatus repeatedly performs a process of performing test recording on the OPC area in the optical disc and reproducing the recorded signal, Calculate the optimal level. The recording power determined in this process is set as the optimum recording power, and when recording data, the recording operation is performed by irradiating the laser beam with the optimum recording power. Therefore, a test recording area is always provided for a recordable optical disc.

In addition, the multilayer optical disc is used not only for the output power of the laser beam for recording the information recording layer in the back by the transmittance of the information recording layer in front, but also for each information recording layer as a recording film. Optimal recording conditions for each information recording layer (optimal recording power, optimal recording pulse conditions, etc.) due to differences in the composition of the recording material, the thickness of the recording film such as the recording film or protective layer, and the reflective layer Is different. Therefore, an OPC area for adjusting such recording conditions is required for all information recording layers.

Next, a multilayer optical disk as an example of the multilayer optical information recording medium of the present invention will be described with reference to the drawings. FIG. 10 shows an area configuration on the plane of the multilayer optical disc medium 101. An inner zone 1004, a data area 1001, and an outer zone 1005 are arranged from the inner peripheral side of the optical disk medium. In the inner zone 1004, a PIC (Permanent Information & Control data) area 1003 and an OPC / DMA area 1002 are arranged. The OPC area is an area used for performing test recording and obtaining optimum recording power and recording pulse train conditions for the disc or each information recording layer before recording data in the data area 1001. Sometimes called a learning area. Also, test recording is performed in order to adjust fluctuations in recording power and recording pulse trains when there are environmental variations such as individual variations of optical disk devices, sudden temperature fluctuations, and adhesion of dust and dirt. It is also an area.

The PIC area 1003 is a reproduction-only area, and records disk management information by modulating the groove at high speed. Disc management information includes recommended values for OPC parameters, write strategy type, laser pulse generation timing and length (recording pulse conditions) necessary for obtaining optimum recording power, recording linear velocity, reproduction power, version Numbers are recorded. Although not shown in FIG. 10 on the inner periphery side of the PIC area, a unique number for media identification is recorded in an area called BCA (Burst Cutting Area) in a format in which the information surface is burned into a barcode. It is used for rights protection. The data area 1001 is an area for actually recording data designated by the user on the optical disc, and is also called a user data area. In the outer zone, there is no reproduction-only PIC area. Similar to the inner zone, an area for test recording and an OPC / DMA area related to management information of recording data are arranged.

Next, FIG. 9 shows a schematic diagram of the stack structure of the four-layer optical disk medium of the present invention. Hereinafter, in order to make the abbreviation coincide with the number of each information recording layer of the information recording layer for convenience in the present embodiment, the layer number starts from the 0th information recording layer instead of the first information recording layer. 905 is a substrate, 901 is a 0th information recording layer L0 (L0 is abbreviated Layer 0), 902 is a first information recording layer L1, 903 is a second information recording layer L2, and 904 is a third information recording layer L3. It is. Reference numeral 909 denotes a cover layer, and laser light is incident from the cover layer side.

The thickness of the substrate 905 is approximately 1.1 mm, the thickness of the cover layer of 909 is at least 40 μm or more, and each information surface is separated by transparent space layers of 906, 907, and 908. In this embodiment, as a specific example, the thickness of the cover layer 909 is 53 μm, the thickness of the space layer between L3 and L2 is 12 μm, the thickness of the space layer between L2 and L1 is 20 μm, and the space layer between L1 and L0 The thickness is 15 μm. The interval between the information recording layers separated by the space layer is preferably designed so that the interference of diffracted light from each information recording layer (interlayer interference) is reduced, and is limited to the interlayer distance depending on the thickness of the space layer described above. It is not done.

Next, FIG. 2 shows a cross section of the track layout of each layer of the four-layer optical disk of the present invention. In FIG. 2, the 0th information recording layer of the four-layer optical disk medium is formed by recording a unique ID unique to the medium called BCA in a format that burns out the information surface. BCA forms recording data in a bar code form by forming recording marks so as to be arranged concentrically. This is formed only at L0.

The next area is the PIC area. In the PIC area, information called disc management information or DI (Disc Information) is recorded in advance. Disc management information includes version number, layer number, maximum recording speed, write-once / rewritable disc type, recommended recording power for each information recording layer, various parameters required for OPC, recording pulse conditions, write strategy, copy Information used for protection is recorded. In the PIC area, disc management information is recorded by wobbling a guide groove (Groove) formed in a spiral shape. These pre-recorded information is read-only information that cannot be rewritten, and disc management information is recorded in advance by the disc manufacturer when the disc is manufactured. That is, the BCA and PIC areas are read-only areas.

In the next area, an OPC area and a disc management area (DMA) are provided in which the optical disc apparatus performs test recording such as recording power and recording pulse conditions. The OPC area is used for test recording in order to calibrate the fluctuations in recording power and recording pulse conditions at the time when the disc is inserted into the optical disc apparatus or when a certain temperature change occurs during operation. This is a test recording area to be performed. DMA (Disc Management Area) is an area for managing disc management information and defect information.

The radius of 24.0 mm to 58.0 mm is the data area. The data area is an area in which data desired by the user is actually written. In the data area, when there is a part that cannot be recorded / reproduced due to a defect in PC use etc., an ISA before and after the data area for recording / reproducing user data is used as a replacement area for replacing the part (sector, cluster) that cannot be recorded / reproduced. (Inner Space Area) and OSA (Outer Space Area) are set. In real-time recording that requires a high transfer rate, such as video recording / playback, the replacement area may not be set. From the radius of 58.0 mm, the outer periphery is the outer zone. The outer zone has the same OPC area and disk management area (DMA) as the inner zone. In addition, it is used as a buffer area so that overrun may occur during seek.

Here, areas corresponding to the BCA are provided in the first to third information recording layers (L1 to L3), but the unique ID is not recorded. This is because even if BCA information such as a unique ID is newly recorded in the first to third information recording layers (L1 to L3), there is a possibility that reliable recording cannot be performed. Conversely, by not recording BCA except for L0, the reliability of BCA of L0 is improved.

In the four-layer optical disc medium of the present invention, the read-only PIC area in which disc management information and the like are recorded in advance at the time of disc manufacture is arranged only on the 0th information plane (L0). By doing so, in the optical disc apparatus, the disc management information of all information planes from L0 to L3 can be read at once, and the startup time can be shortened.

FIG. 15 shows a cross section of the track layout of each layer of another four-layer optical disk of the present invention. The difference from the four-layer optical disk shown in FIG. 2 is that the read-only PIC area in which disk management information and the like are recorded in advance at the time of disk manufacture is changed from the 0th information plane (L0) to the 3rd information plane (L3). It is a point arranged in. By doing so, in the optical disc apparatus, the data of the individual information recording layers L0, L1, L2, and L3 can be distributed and recorded, so that the PIC information of any information recording layer is destroyed or deteriorated. Even in this case, the disc management information in the PIC area of another information recording layer can be read, and the reliability can be improved. Also, since the PIC area can be distributed and arranged in each information recording layer, the space of the PIC area of one information recording layer can be reduced, and the lead-in zone can be allocated to the OPC area accordingly. It can be used efficiently.

Next, FIG. 14 shows the usage direction of the cluster in the OPC area.

The address order of the 0th information recording layer L0 and the second information recording layer L2 is recorded in the direction from the inner periphery to the outer periphery, and the recording / reproducing of the data area is performed from the inner periphery to the outer periphery according to the address order. Do in the direction.

Also, the address order of the first information recording layer L1 and the third information recording layer L3 is recorded from the outer periphery to the inner periphery, and the data area is recorded and reproduced from the outer periphery to the inner periphery.

By proceeding such recording and reproduction in the data area, the full seek from the outer periphery to the inner periphery is not required, and the 0th information recording layer (L0) inner periphery → outer periphery, first information recording layer (L1) ) Recording or reproduction can be performed sequentially from the outer periphery to the inner periphery and the inner layer to the previous layer, and real-time recording at a high transfer rate such as video recording and reproduction can be performed for a long time.

クラスタ Use the OPC area cluster in the opposite direction to the data area. L0 and L2 are used from the outer periphery to the inner periphery, and L1 and L3 are used from the inner periphery to the outer periphery. For example, when OPC is performed in the L1 1401 cluster, after the first OPC is recorded in the area 1402 in the cluster 1401, the marker in the area 1403 is recorded, and in the second OPC recording, the area 1404 is moved in the direction shown in the figure. Record.

(Embodiment 1)
Hereinafter, the physical format of the multilayer optical disc according to the first embodiment of the present invention, particularly the arrangement of the OPC area, will be described with reference to the drawings.

FIG. 3 is a diagram showing an example of a physical format in which an OPC area is arranged in each information recording layer in the first embodiment of the present invention. FIG. 3 is a diagram showing an example of the physical format of the optical disk medium 101 having four information recording layers, particularly an arrangement of the OPC area. The zeroth information recording layer (L0) is located in the farthest information recording layer farthest from the laser beam incident side, and the first information recording layer (L1) is in front of the zeroth information recording layer. It is provided on the light incident side. Further, second (L2) and third (L3) information recording layers are sequentially arranged on the laser beam incident side in order from the side closer to the first information recording layer. In these information recording layers, an inner zone, a data zone, and an outer zone are formed from the inner periphery according to the radial position.

The inner zone of the 0th information recording layer is a read-only area formed at the time of disc creation, called a BCA area (Burst Cutting Area) and a PIC area (management data area) from the inner periphery. Control information). The area up to the PIC area is a read-only area, and the outer peripheral side of the PIC area is a recordable area. Next, a second test recording area (OPC0-B area) for test recording conditions for recording and / or reproducing data, a DMA in which OPC area management information and the like are recorded, and a first test A recording area (OPC0-A area) is arranged. Further, although not shown in the drawing, a protection area that is not written is provided as a buffer area, adjacent to the test recording area (OPC area).

In the inner zones of the first to third information recording layers, a buffer area, a second test recording area (OPC-B area), a DMA, and a first test recording area (OPC-A area) are arranged. Although not shown in the drawing adjacent to the test recording area (OPC area), the buffer area is a buffer area for mitigating interference between adjacent areas, and the protection means that writing means a write prohibited area is not performed. A region having a function as a region is provided.

OPC0b, OPC1b, OPC2b, and OPC3b, which are the second test recording areas (OPC-B areas) of the 0th to third information recording layers, are arranged on substantially the same radial position. The reason for being on substantially the same radial position is that when the information recording layers are stacked at the time of disc production, the error of the radial position of each layer cannot be accurately stacked to ± 0 μm. Accordingly, it means that they are arranged on the same radial position including an error of an eccentric amount defined in advance. Similarly, the first test recording areas (OPC-A areas) OPC0a, OPC1a, OPC2a, and OPC3a of the 0th to third information recording layers are arranged on approximately the same radial position.

∙ A data zone is located outside the inner zone, and user data is recorded in the data area of this zone.

An outer zone is arranged outside the data zone and includes a third test recording area (OPCc area). OPC0c, OPC1c, OPC2c, and OPC3c are arranged in order from the 0th information layer to the 3rd information layer. Has been placed. OPC0c, OPC1c, OPC2c, and OPC3c, which are the third test recording areas (OPC-C areas) of the zeroth to third information recording layers, are arranged on substantially the same radial position.

As shown in FIG. 3, by arranging the first test area, the second test area, and the third test area on each information layer at substantially the same radial position, a limited inner zone and outer zone are formed. It can be used effectively and the space efficiency can be improved. In addition to the four-layer disc of this embodiment, even when the number of layers is increased to eight or sixteen layers, it is possible to secure a test recording area without increasing the physical size of the inner zone. That is, the test recording area can be secured without pressing the recording capacity of the data area. In addition, the physical size of the OPC area of each information recording layer should be larger in the limited inner zone or outer zone than when the test recording areas are arranged so as not to overlap each other. Thus, it is possible to perform highly reliable recording power adjustment and write strategy adjustment without reducing the number of test recordings. Particularly, in the case of an optical disk medium that can be recorded only once, such as a write-once optical disk, there is no possibility that the OPC area will be used up at an early stage even though the user data area is empty, and test recording cannot be performed. Thus, it is possible to reduce the possibility of being unable to write to the optical disc.

Next, a method for dividing the first and second OPC areas will be described. First, a method for using the first test recording area (OPC-A area) will be described.

In the first test recording area (OPC-A area), the recording power for test recording is not limited, and after starting the optical disk, parameters necessary for performing OPC from the PIC area are read and the first OPC is performed. It is an area. Until the optimum recording power is obtained by performing the OPC, there is no guarantee that the power level emitted from the laser is accurately emitted due to the variation or change with time of each optical disc apparatus. Alternatively, there may be a deviation from the recording power determined in advance at the time of manufacturing the disk due to the variation of each optical disk. Alternatively, after performing test recording once with a combination of the same optical disk apparatus and optical disk medium, the optimum recording power obtained by the combination of the apparatus and medium is recorded in a memory of the optical disk apparatus or a predetermined area of the optical disk medium. There is a method of using the recording power at the next recording. However, during the next test recording, there are various factors such as dust and dirt adhering to the optical system parts of the optical pickup, fingerprints adhering to the disk, and the laser characteristics changing due to changes in the outside air temperature. It may happen that light is not emitted accurately at the recording power to be done.

In summary, in the OPC area, in the process of learning the recording power, there is a possibility that test recording is performed at a recording power higher than the optimum recording power as compared with the recording power appropriate for recording data. Even if test recording is performed using a history of test recording performed in the past using the same device and medium combination, even if the time has passed since the last recording, the optimum recording power Test recording may be performed with high recording power. If test recording is performed with excessive power in the OPC area of the front information recording layer, it is affected by intensity changes when the laser light passes through the front information recording layer, and the information recording layer in the back Then, it is considered that the optimum recording power cannot be derived by OPC. Specifically, there is a possibility that a deviation from the optimum recording power, a reproduction signal reading error, a tracking error signal or a focus error signal is distorted, and tracking or focus servo becomes unstable.

Assuming the various possibilities as described above, the recording order between the layers in the OPC-A area is OPC-A in the order of the information recording layer farther from the laser light incident side and the information recording layer in the back to the front. It is assumed that the area will be used. Further, since the OPC-A area is arranged so as to overlap between the information recording layers, even if test recording is performed with excessive recording power, the OPC-A area in the back has already been test-recorded, or Since the innermost information recording layer has no inner information recording layer, even if recording is performed with an excessive recording power, the reproduction signal quality of the inner information recording layer is not adversely affected. .

Next, a method of using the second test recording area (OPC-B area) will be described. The OPC-B area is mainly used to obtain the timing and length conditions for generating a recording pulse train called write strategy adjustment using the optimum recording power obtained in the OPC-A area. Since the optimum value of the recording power is obtained in the same information recording layer in which the test recording is performed in the OPC-A area, there is no possibility of writing with an excessive recording power deviating from the optimum recording power.

Also, the recording power of the OPC-B area may be limited. In the OPC-B area, test recording is performed with the optimum recording power obtained in the OPC-A area of the same information recording layer, or when the test recording is performed in the OPC-A area of a different information recording layer, Based on the optimum recording power obtained in the A area, an upper limit value of recording power that can be recorded at the time of test recording in the OPC-B area is set.

The upper limit is based on a calculated value obtained by calculating a ratio between the optimum recording power obtained in the OPC-A area and the recommended recording power recorded in advance in the management data area determined at the time of manufacturing the disc. If the ratio of the difference between the optimum recording power and the recommended recording power is within a certain value, the upper limit value of the recording power for test recording in the OPC-B area is set based on the ratio. A specific description of how to obtain the upper limit will be described in detail in an embodiment described later.

Table 1 summarizes the characteristics of the test recording areas (OPC-A area and OPC-B area) of two different categories as described above. The test recording area is divided into an area (OPC-A area) where the upper limit of the recording power at the time of test recording is not restricted and an area (OPC-B area) where the restriction is provided, and the upper limit recording power determined. A test recording area where test recording must be performed with the following recording power is defined as an OPC-B area, and an area in which no special limitation is imposed on the upper limit of recording power is defined as an OPC-A area.

In addition, there is a limitation in the recording order between the OPC areas of different sections, and writing may be performed at the time of the first test recording after the multilayer optical disk medium is inserted into the optical disk apparatus or with excessive recording power. If it is determined that the recording power is large, test recording is performed in the OPC-A area as the first test recording, and after the recording power is calibrated, the second and subsequent test recordings are performed on the OPC of any information recording layer. -Implement in area B.

Also, the inter-layer recording order of the OPC areas in the same section is limited in the OPC-A area, and is not limited in the OPC-B area. As shown in FIG. 3, the order of recording between the layers in the OPC-A area is as follows. The test recording is performed sequentially from the test recording start point of the 0th information recording layer (L0) in which the OPC-A area is arranged at the innermost position. Do. After the L0 OPC-A area is used up, test recording is performed in the L1 OPC-A area of the previous information recording layer, and after the L1 OPC-A area is used up, the L2 OPC-A area is used. Recording is performed in order from the OPC-A area of the information recording layer arranged on the far side away from the laser beam incident side to the OPC-A area of the information recording layer on the front side, such as performing test recording in the area.

Further, the order of recording between layers in the OPC-B area is not particularly limited, and test recording can be performed by moving to the OPC-B area of any information recording layer as necessary. .

As described above, writing to the OPC-B area with an excessive recording power is performed due to the restriction that the second and subsequent test recordings are performed on the OPC-B area or the upper limit of the recording power is provided. Therefore, random test recording in the OPC-B area is possible, and free recording between the information recording layers due to the defect management and file system management described above can be realized.

Further, since the OPC-A area is arranged not only in L0 but also in the information recording layers from L1 to L3, even if the L0 OPC-A area is used up, the OPC-A areas from L1 to L3 are used in order. Even if the user data area of the write-once optical disk is empty, there is no possibility that the OPC area will be used up at an early stage, and it becomes impossible to write to the optical disk because test recording is not possible. It becomes possible to solve such problems.

(Embodiment 2)
FIG. 4 is a diagram showing an example of a physical format in which an OPC area is arranged in each information recording layer according to the second embodiment of the present invention. The difference from the multilayer optical disk of Embodiment 1 is that, in FIG. 4, a part of the OPC-B area from L1 to L3 is arranged to overlap with the PIC area of the 0th information recording layer, and the same In the information recording layer, the physical size of the OPC-B area is larger than the physical size of the OPC-A area.

Since the OPC-B area is not written with an excessive recording power, when the L0 PIC area is reproduced, the light beam passing through the L1 to L3 OPC-B areas is scattered or diffracted. Accordingly, it is possible to suppress a decrease in reproduction signal quality when reproducing the PIC area.

By devising the physical format arrangement of the test recording area in this way, the OPC area can be arranged on the information recording layer in front of the PIC area, so that the physical area of the test recording area of each layer is limited within the limited physical size of the inner zone. The size can be increased, and the inner zone can be used efficiently.

Also, by increasing the size of the OPC-B area, it is possible to increase the number of test recordings for write strategy adjustment mainly performed in the OPC-B area. In particular, at the time of high linear density recording in which the size of the recording mark / space is smaller than the light spot such as 33.4 GB or 32 GB, the write strategy adjustment must be performed more accurately by increasing the number of write strategy learning. As in this embodiment, since the physical size of the OPC-B area is larger than the physical size of the OPC-A area in the same information recording layer, reliability can be improved without reducing the number of test recordings. High recording power adjustment and write strategy adjustment are possible.

(Embodiment 3)
FIG. 5 is a diagram showing an example of a physical format in which an OPC area is arranged in each information recording layer according to the third embodiment of the present invention. In FIG. 5, L0 has one test recording area (OPC-A area). L1 to L3 are provided with two test recording areas, an OPC-A area and an OPC-B area. A part of the OPC-B area from L1 to L3 is arranged so as to overlap with the PIC area of L0. Since the OPC-B area is not written with an excessive recording power, when reproducing the PIC area of L0, the light beam passing through L1 to L3 is scattered and diffracted, and the PIC area A reduction in reproduction signal quality can be suppressed. Further, the OPC-A regions from L1 to L3 are arranged so as to overlap substantially at the same radial position. The physical size of the OPC-A area of L0 is larger than the physical size of each of the OPC-A areas of L1 to L3.

In addition, by making all the test recording areas of L0 OPC-A areas, the buffer area adjacent to the OPC area can be reduced compared to when two areas of the OPC-A area and the OPC-B area are provided. The number of the inner zones can be reduced, and the inner zone can be used more efficiently.

Further, by arranging a part of the OPC-A area of L0 and the OPC-A areas of L1 to L3 at substantially the same radial position in the configuration shown in FIG. 5, the rear side of the OPC-A area of L1 to L3 is arranged. Thus, it is not necessary to provide a buffer area at L0 at the radial position, and the inner zone can be used more efficiently.

Further, the physical size of the OPC-A area of L0 is larger than the physical size of the OPC-A area of L1 to L3. The probability that the OPC-A region is eliminated can be reduced. Learning at the time of activation can be increased at L0, and the activation time can be shortened.

(Embodiment 4)
FIG. 6 is a diagram showing an example of a physical format in which an OPC area is arranged in each information recording layer according to the fourth embodiment of the present invention. In FIG. 6, L0 has one test recording area (OPC-A area). L1 to L3 are provided with one test recording area of the OPC-B area. A part of the OPC-B area from L1 to L3 is arranged so as to overlap with the PIC area of L0. Since the OPC-B area is not written with an excessive recording power, when reproducing the PIC area of L0, the light beam passing through L1 to L3 is subjected to scattering and diffraction, and the reproduction signal quality of PIC Can be suppressed. Further, the OPC-B regions from L1 to L3 are arranged so as to overlap substantially at the same radial position.

By devising the physical format arrangement of the test recording area in this way, the OPC area can be arranged in the information recording layer in front of the PIC area, so that the physical area of the test recording area of each layer is limited within the limited physical size of the inner zone. The size can be increased, and the inner zone can be used efficiently.

Further, by arranging a part of the OPC-A area of L0 and the OPC-B areas of L1 to L3 at substantially the same radial position in the configuration shown in FIG. 6, the rear side of the OPC-B area of L1 to L3 is arranged. Thus, it is not necessary to provide a buffer area at L0 at the radial position, and the inner zone can be used more efficiently.

(Embodiment 5)
FIG. 7 is a diagram showing an example of a physical format in which an OPC area is arranged in each information recording layer according to the fifth embodiment of the present invention. In FIG. 7, L0 has one test recording area (OPC-A area). L1 to L3 are provided with two test recording areas, an OPC-A area and an OPC-B area. A part of the OPC-B area from L1 to L3 is arranged so as to overlap with the PIC area of L0. Since the OPC-B area is not written with an excessive recording power, when reproducing the PIC area of L0, the light beam passing through L1 to L3 is subjected to scattering and diffraction, and the reproduction signal quality of PIC Can be suppressed. Further, the OPC-B regions from L1 to L3 are arranged so as to overlap substantially at the same radial position. Further, the OPC-A regions from L1 to L3 are arranged so as to overlap substantially at the same radial position.

In this case, the test recording can be started using the OPC-A areas provided in the two information recording layers L0 and L1. The L1 to L3 information recording layers must be semi-transparent layers that transmit light to the back information recording layer in designing the recording film, but there is a restriction on the L0 information recording layer. Absent. That is, the configuration of the recording material and the recording film of the information recording layer is greatly different between L0 and L1 to L3. As described above, since the recording film properties are different between L0 and L1 to L3, the first test recording is performed not only in the OPC-A area of L0 but also in the two OPC-A areas of the OPC-A area of L1. If the upper limit value of the recording power when performing the test recording of L2 and L3 based on the optimum recording power obtained by L1 is the same recording film characteristic, the optimum recording of L2 and L3 It becomes possible to obtain power more accurately.

FIG. 17 is a diagram showing another example of a physical format in which an OPC area is arranged in each information recording layer according to the fifth embodiment of the present invention. In FIG. 17, L0 is provided with two test recording areas (OPC-A areas). L1 to L3 are provided with two test recording areas, an OPC-A area and an OPC-B area. Part of the OPC-A area from L1 to L3 is arranged so as to overlap with the PIC area of L0. In addition, the OPC-A regions from L1 to L3 are roughly overlapped. The OPC-A area from L1 to L3 may be written with an excessive recording power, but a buffer area corresponding to the adjacent area of the OPC-A area from L1 to L3 is secured. A PIC area is also secured in L0 on the far side. Therefore, when reproducing the PIC area of L0, the light beam passing through L1 to L3 is scattered and diffracted. However, in the PIC area arranged on the far side of the buffer area, it is possible to suppress degradation of the reproduction signal quality. it can. Further, the disc management data of each information recording layer is recorded in the block unit in the PIC area, and the unit block is repeatedly recorded in the PIC area a plurality of times. Therefore, it is not necessary to read the disk management data in all areas of the PIC area. That is, there is no problem as long as the disk management data of at least one block among a plurality of repeatedly recorded blocks can be read. The disk management data in the PIC area on the back side of the buffer areas L1 to L3 may be read without any problem. In other words, the PIC area is arranged on the back side of the L1 to L3 OPC area, and the buffer area is provided adjacent to the L1 to L3 OPC area so that the space in the lead-in zone can be efficiently reduced. It is possible to secure a sufficient OPC area for use.

Also, the PIC area is a reproduction-only area, and disc management information is recorded by modulating the groove at high speed. Further, since the track pitch (0.35 μm) of the PIC area is wider than the track pitch (0.32 μm) of the data area, the data read reliability is originally designed to be high. Therefore, even if test recording is performed with an excessive recording power in the L1 to L3 OPC-A areas arranged in front of the PIC area, the deterioration in the reading performance of the disc management information recorded in the PIC area is additionally recorded. The reading reliability is designed to be higher than that in the case where read data or rewritable data is read. Therefore, even if the PIC area of L0 and the OPC-A areas of L1 to L3 are arranged so as to overlap, the reliability at the time of reading the disc management information recorded in the PIC area is not greatly impaired. By arranging the PIC area and the OPC-A area so as to overlap each other, the space in the lead-in zone can be used efficiently and a sufficient OPC area can be secured.

Further, in FIG. 17, the OPC-B region from L1 to L3 and the OPC-A region from L0 are arranged so as to overlap substantially at the same radial position. Further, the OPC-A regions from L1 to L3 are arranged so as to overlap substantially at the same radial position. In this way, using the OPC-A areas provided in the two information recording layers L0 and L1, it is possible to use the OPC-A area with the two points L0 and L1 as test recording start points. . The L1 to L3 information recording layers must be semi-transparent layers that transmit light to the back information recording layer in designing the recording film, but there is a restriction on the L0 information recording layer. Absent. That is, the configuration of the recording material and the recording film of the information recording layer is greatly different between L0 and L1 to L3. Thus, since the recording films have different properties in L0 and L1 to L3, the first test recording is performed not only in the OPC-A area of L0 but also in the two OPC-A areas of L0 and L1. If L2 and L3 are characteristics of similar recording films, it is best to obtain the upper limit value of the recording power when performing test recording of L2 and L3 based on the optimum recording power obtained in L1. It becomes possible to obtain the recording power with higher accuracy.

Further, although the OPC-A area is divided into two in L0 in FIG. 17, one may be an OPC-B area, or the arrangement of the OPC areas in L0 may be changed and combined into one OPC-A area. . By combining them into one, it is not necessary to provide a buffer area, and the space efficiency of the lead-in area is improved.

Also, by placing the L0 OPC area adjacent to the PIC area across the buffer area, the connection zone between the HFM groove and the wobble groove can be used as the buffer area, improving the space efficiency of the lead-in area. To do.

Here, in order to clarify the characteristics of the present invention, the arrangement configuration of the OPC area in the optical disc having two information recording layers will be described with reference to FIG. FIG. 18A shows a write-once disc 1011 having two information recording layers, and FIG. 18B shows a rewritable disc 1012 having two information recording layers. Actually, buffer areas and the like are arranged in some places to absorb eccentricity and interference from adjacent areas, but the description thereof is omitted here for convenience.

In both the write once disc 1011 (BD-R, etc.) and the rewritable disc 1012 (BD-RE, etc.), the track direction (light spot traveling direction) of the layer (L0) far from the light source is from the inner circumference side to the outer circumference side. The direction is the direction from the left side to the right side in FIG. Further, the track direction of the layer (L1) closer to the light source is the direction from the outer peripheral side to the inner peripheral side (the direction from the right side to the left side in FIG. 18) (opposite path). Further, OPC0, which is a test recording area in the L0 layer, and OPC1, which is a test recording area in the L1 layer, do not overlap in radial position.

In the case of the write-once disc 1011, the PIC area is arranged in the L0 layer and is not arranged in the L1 layer. And OPC1 is arrange | positioned in the position which the PIC area | region of L0 layer and a radial position partially or all overlap. Moreover, OPC0 is arrange | positioned in the radial position of the outer peripheral side rather than OPC1. Also, the usage direction 1021 of OPC0 is the direction from the outer peripheral side region in OPC0 to the inner peripheral side region in OPC0, whereas the usage direction 1031 in OPC1 is the outer peripheral region in OPC1 from the inner peripheral side region in OPC1. The direction of the side area.

In the case of the rewritable disc 1012, the PIC area is arranged in both the L0 layer and the L1 layer, and the OPC0 is arranged at a radial position on the inner peripheral side of the OPC1. Further, the usage direction of the OPC is not restricted like the write-once optical disc 1011.

Here, TDMA (Temporary Disc Management Area) will be described. When the optical disk is a write-once disk, the DMA in FIGS. 1 to 17 and the description thereof strictly refers to the TDMA, and the TDMA is an area specific to the write-once disk. When performing defect management, etc. with a write-once disc, if the defect information (DFL (defect list), etc.) indicating the correspondence between the replacement source area and the replacement destination area is updated, it can only be handled in the form of additional recording. Update information is added to this TDMA.

When the write-once disc is finalized (a closing process in which recording is prohibited and only playback is possible thereafter), the final defect information of TDMA is recorded in the DMA in the INFO area. The Next Available PSN information described above is different from the defect information and is information necessary for managing the OPC. Therefore, although it is recorded in the TDMA, since test recording is not executed after the finalization, there is no need to manage it, so it is not recorded in the DMA in the INFO area. As described above, the information managed by the TDMA is much larger than the information recorded in the DMA in the INFO area. For example, the DMA in the INFO area is 32 blocks, and each TDMA has 2048 blocks. A sufficient size is secured.

Also, the relationship between TDMA0 and TDMA1 is used in the order of TDMA0 to TDMA1. That is, when recording to TDMA0 becomes impossible due to a decrease in the free area of TDMA0 in the L0 layer or the like, update processing in TDMA1 in the L1 layer is performed.

On the other hand, since the rewritable disc can be updated by rewriting, such defect information is updated using the DMA in the INFO area. In addition, an area at a radial position substantially corresponding to TDMA0 or TDMA1 in the write-once disc is secured as a reserved area whose usage is not particularly determined. Therefore, in the description up to FIG. 17, in the case of a rewritable disc, the area described as DMA does not necessarily have to be DMA, and may be a reserved area.

Here, by comparing the configuration shown in FIG. 17 with the configuration shown in FIG. 18, the following features can be grasped more clearly as the features of the arrangement relationship such as the OPC area and DMA (TDMA) shown in FIG. 17. be able to.

First, in the configuration shown in FIG. 17, there are two or more information recording layers having an OPC area where at least a part of the radial position overlaps the radial position of the PIC area. That is, a part of the read-only management data area (for example, PIC area) and at least a part of the test recording area (for example, OPC area) of the other two or more information recording layers are arranged to overlap. By placing the OPC area on top of the PIC area in a zone with a limited size, the size of the OPC area is kept large while minimizing the configuration in which the OPC areas are arranged at the same radial position. This can reduce the possibility of using up the OPC area. Since the same information is repeatedly recorded in the PIC area, even if those OPC areas are damaged by the laser beam, the information is surely received from the part of the PIC area that does not overlap the damaged OPC area. Can be read out.

In the configuration shown in FIG. 17, there are two or more information recording layers having a write-inhibited area (such as a buffer area) where at least a part of the radial position overlaps the radial position of the PIC area. That is, the read-only management data area (for example, PIC area) and the write-inhibited area (for example, buffer area) of other layers are arranged so as to overlap each other. Since no writing operation is performed in the buffer area, the laser beam is not damaged. Therefore, information can be reliably read from the portion of the PIC area that overlaps the buffer area. If an area on another layer that overlaps a part of the PIC area (for example, the OPC area) is damaged, information may not be read from the corresponding part of the PIC area. However, even in that case, since the same information is repeatedly recorded in the PIC area, the information can be reliably read from the portion of the PIC area overlapping the buffer area. In the PIC area, disk management data of each information recording layer is recorded in units of blocks, and unit blocks are repeatedly recorded in the PIC area a plurality of times. Therefore, the disk management data in almost all areas of the PIC area may be damaged due to the influence of writing in the previous layer and become unreadable. That is, there is no problem as long as the disk management data of at least one block among a plurality of repeatedly recorded blocks can be read. The disk management data in the PIC area on the back side of the buffer areas L1 to L3 may be read without any problem. In other words, the PIC area is arranged on the back side of the L1 to L3 OPC area, and the buffer area is provided adjacent to the L1 to L3 OPC area so that the space in the lead-in zone can be efficiently reduced. It is possible to secure a sufficient OPC area for use.

Further, in the configuration shown in FIG. 17, there is an information recording layer in which an OPC area is arranged on the outer peripheral side instead of the inner peripheral side of DMA (TDMA). DMAs are divided and arranged on the inner and outer peripheral sides of the OPC area. That is, by providing two management data areas (for example, TDMA areas) that can be recorded in one information recording layer on the inner peripheral side and the outer peripheral side of the OPC area, the OPC areas of the other information recording layers and the OPC areas The amount of overlap between layers can be reduced or eliminated. In other words, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be overlapped with each other, but the recordable management data area is located on the inner circumference side. And the outer two are divided into two, and the size of the OPC area and the recordable management data area is both large while minimizing the configuration in which the OPC areas are arranged at the same radial position. be able to. This can reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

Further, in the configuration shown in FIG. 17, there are a plurality of DMAs (TDMA) in which at least some of the radial positions overlap each other. That is, a management data area (for example, DMA (TDMA)) of a certain information recording layer and a management data area (for example, DMA (TDMA)) of another certain information recording layer are arranged such that at least some radial positions overlap each other. Has been placed. By arranging the DMAs (TDMAs) to overlap each other, a zone with a limited size can be used effectively. For example, by arranging both the OPC area and DMA (TDMA) of the information recording layer far from the laser irradiation surface and the DMA (TDMA) of the information recording layer close to the laser irradiation surface so that the radial positions overlap, The zone of the information recording layer on the near side can be used effectively. DMA (TDMA) is irradiated with laser light after power adjustment, and is not damaged by irradiating excessive recording power. Even if DMAs (TDMA) are overlapped, information recording on the back side Information recorded on the layer can be read normally. Moreover, even if the OPC area of the information recording layer far from the laser irradiation surface is damaged by the laser beam, there is no problem from the DMA (TDMA) of the information recording layer arranged on the side of the OPC area close to the laser irradiation surface. Information can be read out.

In the configuration shown in FIG. 17, there is an information recording layer including a plurality of DMAs (TDMA). By providing two management data areas (for example, TDMA areas) that can be recorded in one information recording layer, the amount of overlap between the OPC areas between the OPC areas of other information recording layers is reduced, or Can be eliminated. In other words, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be placed one on top of the other, but the two recordable management data areas are sandwiched between the OPC areas. By dividing and arranging the OPC areas at the same radial position, the size of the OPC area and the recordable management data area can be both large while minimizing the configuration. This can reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

In the configuration shown in FIG. 17, there is an information recording layer that includes two DMAs (TDMA) and an OPC area is arranged between the TDMAs. Thereby, the OPC area can be arranged at a position away from the user data area. Also, with such a configuration, for example, the OPC region of the information recording layer far from the laser irradiation surface and the DMA (TDMA) of the information recording layer near the laser irradiation surface may overlap each other in radial position. In this case, even if the OPC region of the information recording layer far from the laser irradiation surface is damaged by the laser beam, information can be read out from the DMA (TDMA) of the information recording layer near the laser irradiation surface without any problem. . Further, when the OPC area is arranged inside the DMA (TDMA), the remaining zone whose size is limited can be used effectively.

In the configuration shown in FIG. 17, there is an information recording layer in which write-inhibited areas (such as buffer areas) are arranged at both ends of the OPC area. A first buffer area is arranged adjacent to the inner peripheral side of the OPC area. A second buffer area is arranged adjacent to the outer peripheral side of the OPC area. A first DMA (TDMA) is disposed adjacent to the inner periphery of the first buffer area, and a second DMA (TDMA) is disposed adjacent to the outer periphery of the second buffer area. . Information of the same attribute is recorded in the first and second DMAs (TDMA). That is, when an OPC area is arranged between two DMAs (TDMA), a buffer area is arranged between the DMA (TDMA) and the OPC area. Thereby, even if the OPC area is damaged by the laser beam, it is possible to prevent the DMA (TDMA) from being affected. In addition, since information of the same attribute is recorded in two DMAs (TDMA), even if one DMA (TDMA) is damaged and cannot be read out, the information is surely received from the other DMA (TDMA). Can be read out. In addition, by providing two management data areas (for example, TDMA areas) that can be recorded across an OPC area in one information recording layer, an OPC area between other OPC areas is provided between other OPC areas. Can be reduced or eliminated. That is, if a recordable management data area (for example, a TDMA area) is secured as one block, the OPC areas must be overlaid. On the other hand, the management data area that can be recorded across the OPC area is divided into two, and the OPC area and the OPC area can be recorded while minimizing the configuration in which the OPC areas are arranged at the same radial position. It is possible to secure a large size for both the management data area and reduce the possibility that the OPC area and the recordable management data area will be used up. Conversely, if the OPC area is divided and arranged, the buffer area adjacent to the OPC area must be increased in proportion to the OPC area. However, when the recordable management data area is divided and arranged, the buffer area is buffered in the adjacent portion. Since it is not necessary to provide an area, the lead-in zone can be used effectively.

Note that the information recording medium of the present invention does not have to satisfy all of the above-described features shown in FIG. 17, and may have a configuration that employs any one of these features, or a configuration that arbitrarily combines a plurality of features. Good.

(Embodiment 6)
Next, the recording method of the multilayer optical information recording medium of the present invention will be described with reference to the drawings. A test recording procedure according to the sixth embodiment of the present invention will be described with reference to FIG. The multilayer optical disk used is the multilayer optical disk medium used in the first to fourth embodiments.

The first step is to read the disc management information in the PIC area and the OPC management information recorded in the DMA. Recommended recording power of each information recording layer pre-recorded in the PIC area, various parameters necessary for OPC, write strategy parameter, position of the OPC area of each information recording layer recorded in the DMA, eg, recording start address and / or Alternatively, information indicating the end address and Next Available PSN (Physical Sector Number) which is information indicating the currently available position in each OPC area are read. When the optical disk is loaded on the optical recording / reproducing apparatus, the OPC area management information of the DMA is read, the position of the OPC area in the optical disk and the position in the usable OPC area are confirmed from this information, and the confirmed position OPC can be performed. If it is determined from the read information that recording is possible in the OPC-A area of the i-th (i is an integer from 0 to 3) information recording layer, the process proceeds to the next step. If all the OPC-A areas are used up, the test recording becomes impossible and the test recording is stopped.

The second step is a step in which test recording is performed in the OPC-A area of the i-th information recording layer to obtain an optimum value of recording power. At the time of test recording, test recording is performed with a plurality of recording powers using the OPC parameters read from the PIC area, the modulation degree characteristics of the recorded signals are measured, and predetermined results are obtained based on the results. An optimum recording power is obtained by performing calculation. A method for obtaining the optimum recording power from the measurement result of the modulation degree will be described in an embodiment described later.

Next, it is checked whether or not the optimum recording power obtained in the OPC-A area is the optimum recording power that should originally be obtained. The optimum recording power (Pwoi) obtained in the OPC-A area in the operation procedure for obtaining the optimum recording power described above, and the recommended recording power (Pwpi) read from the disc management information recorded in advance in the PIC area of the optical disc If the optimum recording power (Pwoi) is larger than the recommended recording power (Pwpi), for example, by more than 5% (Pwoi / Pwpi-1> 5%), the obtained optimum recording power (Pwoi) ) Is determined to be inappropriate and the write strategy is changed again, or the above-described OPC procedure is performed again with the write strategy as it is, and the optimum recording power (Pwoi) is obtained again.

As another check method, the optimum recording power obtained in the OPC-A area using the optical disc apparatus in the operation procedure for obtaining the optimum recording power described above is the recording power originally assumed by the optical disc manufacturer at the time of disc creation. In order to prevent a substantial increase in comparison, the optimum modulation power and the target modulation degree (Mmax) of the recommended recording power read from the disc management information pre-recorded in the PIC area on the optical disc are When the modulation degree at the time of recording at the optimum recording power is larger than the target modulation degree (Mmax) (Mo> Mmax) compared with the modulation degree (Mo) of the signal recorded at the recording power, the optimum obtained It is determined that the recording power (Pwoi) is high, and the write strategy is changed again, or the write In ¡°, again the above OPC procedure, again determine the optimum recording power (Pwoi). The modulation degree (Mo) recorded at the optimum recording power is compared with the target modulation degree (Mmax), and the modulation degree at the time of recording at the optimum recording power is equal to the target modulation degree (Mmax). Alternatively, when it is small (Mo ≦ Mmax), the obtained optimum recording power (Pwoi) is determined as the optimum recording power.

Next, test recording is performed using the optimum recording power in the OPC-B area of the i-th information recording layer (if i = 0, the OPC-A area may be used), and a recording pulse condition (write strategy condition) ). This completes test recording on the i-th layer.

Here, although the above example has been described as the method for checking the optimum recording power, the above methods may be combined, or the check may be performed by another suitable method. For example, jitter, MLSE, β, asymmetry, etc. may be used in combination for the determination material.

The third step is a step for making preparations for performing test recording on the j-th layer which is an information recording layer other than the i-th layer. A ratio α (= Pwoi / Pwpi) between the optimum recording power (Pwoi) of the i-th information recording layer and the recommended recording power (Pwpi) is obtained, and the recommended recording power (Pwpi) of the j-th information recording layer is The optimum recording power (Pwyj) predicted for the information recording layer of j is calculated by the following equation.
(Pwyj) = (Pwpj) × α

Further, a value obtained by multiplying the predicted optimum recording power (Pwyj) of the jth information recording layer by a predetermined coefficient X (for example, 1.1) is set as the upper limit recording power (Pwmaxj) of the jth layer. decide.
(Pwmaxj) = (Pwyj) × X
Here, the ratio α is a ratio between the optimum recording power obtained by the test recording and the recommended recording power. That is, an index indicating how much the recording power set by the optical disk apparatus due to dust, dust, or other causes in the optical disk apparatus is the absolute value of the recording power relative to the recording power determined by the disk manufacturer when the optical disk was created. It is. Therefore, when α = 1, the optimum recording power obtained matches the recommended recording power, and the recording power obtained by test recording using the optical disc apparatus was recorded in advance by the disc manufacturer at the time of disc creation. It means that it matches the power. When α> 1, as an example, dust, dust, etc. adhere to an optical system of an optical disk device, for example, an objective lens. Between the recording power immediately after the laser beam is emitted on the way and the recording power on the optical disk board surface Occurs when there is a loss. Or, there may be an error in the calibration of the recording power of the optical disc apparatus. If these are the causes, the same recording power loss and calibration error also occur in the other information recording layers. Therefore, the recording power set by the optical disk device and the actual information recording of the optical disk using the ratio α. The purpose is to correct between the irradiation power on the surface.

The fourth step is a step of performing test recording in the OPC-B area of the j-th information recording layer to obtain the optimum recording power and recording pulse condition of the j-th layer. At the time of test recording, test recording is performed with a plurality of recording powers equal to or lower than the upper limit recording power (Pwmaxj) determined in the third step, the modulation characteristic of the recorded signal is measured, and the jth information recording is performed. The optimum recording power (Pwoj) of the layer is obtained. After the optimum recording power (Pwoj) of the jth information recording layer is determined, test recording is performed on the OPC-B area of the jth information recording layer with the optimum recording power (Pwoj), and the recording pulse condition (write strategy condition) Find the optimal value. Thus, the test recording on the jth information recording layer is completed. Although omitted here, as in the second step, a processing procedure for checking whether or not the obtained optimum recording power (Pwoj) is the optimum recording power that should be originally obtained may be inserted.

The fifth step is a step for checking whether or not the test recording of all information recording layers has been completed. If the test recording has not been completed for all the information recording layers, the process returns to the fourth step to perform the test recording for the remaining information recording layers to obtain the optimum values of the recording power and the write strategy. If test recording has been completed for all information recording layers, test recording completion processing is performed. That is, the DMA Next Available PSN information is updated and the test recording is completed.

In this embodiment, X = 1.1 as an example. However, the present invention is not limited to X = 1.1, and X = 1 may be set so that the optimum recording power to be predicted is recorded as an upper limit. .

If the optimum recording power obtained as a result of test recording in the OPC-B area exceeds the upper limit value of the recording power calculated in step 3, the upper limit value of the recording power may be updated to an appropriate value. However, test recording cannot be performed beyond the previously determined upper limit power until the optimum power is obtained.

Further, although the recording method is described in the embodiment of the present invention, it is because the procedure of the recording operation is mainly described, and is not necessarily limited to the recording operation, and includes the optical recording / reproducing method including the reproducing method. May be.

(Embodiment 7)
Next, the recording method of the multilayer optical information recording medium of the present invention will be described with reference to the drawings. A test recording procedure according to the seventh embodiment of the present invention will be described with reference to FIG. The multilayer optical disk used is the multilayer optical disk medium used in the fifth embodiment.

The first step is to read the disc management information in the PIC area and the OPC management information recorded in the DMA. Recommended recording power of each information recording layer pre-recorded in the PIC area, various parameters necessary for OPC, write strategy parameter, position of the OPC area for each information recording layer recorded in the DMA, eg, recording start address and Next, information indicating the end address and Next Available PSN (Physical Sector Number), which is information indicating the currently usable position in each OPC area, are read. When the optical disk is loaded on the optical recording / reproducing apparatus, the OPC area management information of the DMA is read, the position of the OPC area in the optical disk and the position in the usable OPC area are confirmed from this information, and the confirmed position OPC can be performed. If it is determined from the read information that recording is possible in the OPC-A area of the 0th information recording layer and the OPC-A area of the i-th information recording layer, the process proceeds to the next step. If the OPC-A area of the 0th layer has been used up or if all the OPC-A areas have been used up, test recording is disabled and test recording is stopped. If the OPC-A area of the 0th information recording layer can be recorded and the first to third OPC-A areas are used up, test recording is performed according to the procedure of the sixth embodiment.

The second step is a step in which test recording is performed in the OPC-A area of the 0th information recording layer to obtain the optimum value of the recording power. At the time of test recording, test recording is performed with a plurality of recording powers using the OPC parameters read from the PIC area, the modulation degree characteristics of the recorded signals are measured, and predetermined results are obtained based on the results. An optimum recording power is obtained by performing calculation. Further, test recording is performed with the optimum power, and the optimum recording pulse condition (write strategy condition) of the 0th layer is obtained. Thus, the test recording on the 0th information recording layer is completed. A method for obtaining the optimum recording power from the measurement result of the modulation degree will be described in an embodiment described later.

The third step is a step in which test recording is performed in the OPC-A area of the i-th information recording layer to obtain an optimum value of recording power. At the time of test recording, test recording is performed with a plurality of recording powers using the OPC parameters read from the PIC area, the modulation characteristics of the recorded signals are measured, and predetermined results are obtained based on the results. To obtain the optimum recording power.

Next, it is checked whether or not the optimum recording power obtained in the OPC-A area is the optimum recording power to be originally obtained. The optimum recording power (Pwoi) obtained in the OPC-A area of the i-th information recording layer in the operation procedure for obtaining the optimum recording power and the disc management information recorded in advance in the PIC area of the optical disc are read. The recommended recording power (Pwpi) is compared, and when the optimum recording power (Pwoi) is, for example, 5% or more larger than the recommended recording power (Pwpi) (Pwoi / Pwpi-1 ≧ 5%), The optimum recording power (Pwoi) is determined to be inappropriate, and the write strategy is changed again, or the above-described OPC procedure is performed again using the write strategy as it is, and the optimum recording power (Pwoi) is obtained again.

As another check method, the optimum recording power obtained in the OPC-A area using the optical disc apparatus in the operation procedure for obtaining the optimum recording power described above is the recording power originally assumed by the optical disc manufacturer at the time of disc creation. In order to prevent a substantial increase in comparison, the optimum modulation power and the target modulation degree (Mmax) of the recommended recording power read from the disc management information pre-recorded in the PIC area on the optical disc are When the modulation degree at the time of recording at the optimum recording power is larger than the target modulation degree (Mmax) (Mo> Mmax) compared with the modulation degree (Mo) of the signal recorded at the recording power, the optimum obtained It is judged that the recording power (Pwoi) is high and the write strategy is changed again, or the write power is kept as it is. In Strategies, again the above OPC procedure, again determine the optimum recording power (Pwoi). The modulation degree (Mo) recorded at the optimum recording power is compared with the target modulation degree (Mmax), and the modulation degree at the time of recording at the optimum recording power is equivalent to the target modulation degree (Mmax) or If it is small (Mo ≦ Mmax), the determined optimum recording power (Pwoi) is determined as the optimum recording power.

Next, test recording is performed with the optimum power in the OPC-B area of the i-th layer, and the optimum recording pulse condition (write strategy condition) of the i-th layer is obtained. This completes test recording on the i-th layer.

The fourth step is a step for preparing to perform test recording on the j-th layer, which is an information recording layer other than the i-th layer. A ratio α (= Pwoi / Pwpi) between the optimum recording power (Pwoi) of the i-th information recording layer and the recommended recording power (Pwpi) is obtained, and the recommended recording power (Pwpi) of the j-th information recording layer is The optimum recording power (Pwyj) predicted for the information recording layer of j is calculated by the following equation.
(Pwyj) = (Pwpj) × α

The fifth step is a step of performing test recording in the OPC-B area of the j-th information recording layer to obtain the optimum recording power and recording pulse condition of the j-th layer. At the time of test recording, test recording is performed with a plurality of recording powers less than or equal to the upper limit recording power (Pwmaxj) determined in the fourth step, the modulation characteristic of the recorded signal is measured, and the jth information recording The optimum recording power (Pwoj) of the layer is obtained. After the optimum recording power (Pwoj) of the jth information recording layer is determined, test recording is performed on the OPC-B area of the jth information recording layer with the optimum recording power (Pwoj), and the recording pulse condition (write strategy condition) Find the optimal value. Thus, the test recording on the jth information recording layer is completed. Although omitted here, as in the third step, a processing procedure for checking whether or not the obtained optimum recording power (Pwoj) is the optimum recording power to be originally obtained may be inserted.

The sixth step is a step for checking whether or not the test recording of all information recording layers has been completed. If the test recording has not been completed for all the information recording layers, the process returns to the fifth step to perform test recording for the remaining information recording layers to obtain the optimum values of the recording power and the write strategy. If test recording has been completed for all information recording layers, test recording completion processing is performed. That is, the DMA Next Available PSN information is updated and the test recording is completed.

If the optimum recording power obtained as a result of the test recording in the OPC-B area exceeds the upper limit value of the recording power calculated in step 4, the upper limit value of the recording power may be updated to an appropriate value. However, test recording cannot be performed beyond the previously determined upper limit power until the optimum power is obtained.

(Embodiment 8)
Next, a recording / reproducing apparatus 100 for a multilayer optical information recording medium according to the present invention will be described with reference to the drawings. The apparatus 100 is an apparatus that performs at least one of recording and reproduction of information with respect to the information recording medium 101, and may be a reproduction-only apparatus.

FIG. 1 is a diagram for explaining the overall configuration of a recording / reproducing apparatus for a multilayer optical information recording medium according to an eighth embodiment of the present invention. An operation of performing test recording and performing test recording on each information recording layer using the multilayer optical discs of Embodiments 1 to 5 and the recording methods of Embodiments 6 and 7 will be described.

The multilayer optical disc 101 is a multilayer optical information recording medium such as a BD-R medium. The recording / reproducing apparatus 100 includes an optical pickup 111, a spindle motor 122, and a servo control unit 112. The optical pickup 111 includes a diffraction element 102,

collimating lenses

103 and 104, an objective lens 105, a laser light source 106, an actuator 107,

photodetectors

109 and 110, and a servo control unit 112.

The recording / reproducing apparatus 100 includes a recording unit that reproduces management data from a management data area (PIC, DMA, TDMA, etc.) and records information on an information recording medium based on the management data. The recording unit includes a spherical aberration correction unit 108, an RF signal calculation unit 113, a laser drive circuit 114, a laser output control circuit 115, a recording power control unit 116, a reproduction signal detection unit 117, and a management information reading unit. 118, a calculation unit 119, a memory 120, and a system control unit 121. The recording unit also adjusts the recording conditions using the test recording area, and performs an operation of recording information on the multilayer optical disc 101 under the adjusted recording conditions.

An optical pickup 111 including a laser light source 106 and

photodetectors

109 and 110 functions as an irradiating unit that irradiates each information recording layer of the multilayer optical disc 101 with laser light and receives reflected light reflected by the information recording layer. Functions as a light receiving unit.

The RF signal calculation unit 113, the reproduction signal detection unit 117, the management information reading unit 118, the calculation unit 119, the memory 120, and the system control unit 121 reproduce the information based on the electrical signal obtained by receiving the reflected light. It functions as a part.

The light beam emitted from the laser light source 106 is converted into parallel light by the

collimating lenses

103 and 104, enters the objective lens 105, and is converged on the information recording surface of the multilayer optical disc 101. The light beam reflected by the multilayer optical disc 101 travels back along the original optical path and is collected by the

collimating lenses

103 and 104, and enters the

photodetectors

109 and 110 by the light branching means of the diffraction element 102. Servo signals (focus error signal and tracking error signal) and information signal (RF signal) are generated from the output signals of the

photodetectors

109 and 110. The actuator 107 performs focus control, which is position control of the objective lens 105 in the optical axis direction, and tracking control, which is position control perpendicular to the direction in which the objective lens 105 is perpendicular to the traveling direction of the light beam, by the servo control unit 112. It is controlled by driving a driving means such as a magnet. Further, the RF signal calculation unit 113 generates an RF signal. The spherical aberration correction unit 108 drives the collimating lens 104 to perform optimal spherical aberration correction according to the thickness from the surface of each information layer. A laser drive circuit 114 that drives the laser light source 106 in the optical pickup 111, a laser output control circuit 115 that controls the laser drive circuit 114 with a desired laser output, and a plurality of recording powers in the laser output control circuit And a recording power control unit 116 for issuing a test recording, data recording or reproduction instruction, and a reproduction signal detection unit for detecting the signal quality (modulation, asymmetry, β, jitter, MLSE, etc.) of the reproduction signal from the RF signal 117, a management information reading unit 118 that reads out the disc management information of the PIC area and the OPC area management information of the DMA recorded on the multilayer optical disc 101 from the RF signal, reproduces the test recorded signal, and reproduces the signal The optimum recording power is calculated from the modulation degree characteristic detected in step 1, and the optimum recording power is calculated. It calculates the ratio of the word (Pwoi) the recommended recording power (pWPI), provided with a calculation unit 119 for calculating the upper limit power of the test recording. The operation of the calculation unit 119 is as described in Step 3 of Embodiment 6 and Step 4 of Embodiment 7, and calculates the optimum recording power and the upper limit recording power based on the test recording result. Further, the optimum recording power of each information recording layer obtained by the test recording, the ratio (α) between the optimum recording power and the recommended recording power, the memory 120 holding any or all of the upper limit recording power, and the computation result of the computation unit The system control unit 121 sets predetermined recording conditions in the recording power control unit based on the read information of the management information reading unit. The system control unit issues a command to the recording power control unit 116 and repeats the test recording operation until the test recording of all the information recording layers is completed.

Next, a detailed operation for learning the optimum recording power using the recording / reproducing apparatus for the multilayer optical information recording medium will be described.

In FIG. 1, a light beam emitted from a laser light source 106 driven by a laser driving circuit 114 moves through a collimating lens 104 by a spherical aberration correction unit 108, and is a multilayer optical information recording medium (BD-R medium). The light is condensed on a desired information recording layer of the multilayer optical disc 101. The servo control unit 112 controls focus and tracking of the light spot on a desired information recording layer. The optical pickup 111 seeks to the inner periphery of the multilayer optical disc 101 and reads disc management information (DI: Disc Information) in the PIC area. The servo control circuit seeks the light spot to the test recording area of the multilayer optical disc 101 and performs focus and tracking control. The system control unit 121 sets a plurality of powers within a range of ± 10% in the vicinity of the target recording power (Pind), which is one of the OPC parameters in the DI information, and performs test recording a plurality of times while changing the recording power. The recording power control unit 116 is instructed. The laser output control circuit 115 applies power servo so as to emit light at a desired recording power, and the laser drive circuit 114 drives the laser light source 106, and a light beam focused by the objective lens 105 is used to generate a desired test recording area. A signal is recorded on a desired track (or desired cluster).

Next, the playback operation of the recorded signal will be described. Reflected light from the track (cluster) is received by the

photodetectors

109 and 110 in the optical pickup 111 and converted into an electrical signal, and an RF signal is generated by the RF signal calculation unit 113. The reproduction signal detection unit 117 detects the degree of modulation at the plurality of recording powers recorded by the test recording. The modulation degree detected by the reproduction signal detection unit from the RF signal will be described with reference to FIG. FIG. 12 shows a reproduction signal when a signal including an 8T signal is recorded. The upper side of FIG. 12 is the voltage level (I8H) when the 8T space portion formed on the optical disk is reproduced, and the lower side is the voltage level (I8L) when the 8T mark portion formed on the optical disk is reproduced. The reproduction signal detection unit 117 detects the voltage levels (I8H, I8L) of the 8T space which is the longest space and the 8T mark which is the longest mark from the RF signal.

The calculation unit 119 calculates a modulation degree (MOD) from the voltage level (I8H, I8L) detected by the reproduction signal detection unit 117. The modulation degree (MOD) is calculated by calculating MOD = (I8H−I8L) / I8H.

Next, a method for obtaining the optimum recording power that is the optimum value of the recording power from the modulation degree characteristics of a plurality of recording powers will be described. The computing unit 119 calculates the product (MOD × Pw) of the modulation power (MOD) and the recording power (Pw) at the recording power (Pw) from the measurement result of the modulation power for a plurality of test recording powers. . FIG. 13 shows an example of a diagram for explaining the product (MOD × Pw) of the modulation degree and the recording power with respect to the recording power. Using several measurement points in the vicinity of the target recording power (Pind), a tangent line 1301 is drawn and the intercept with the x-axis (power axis) is defined as the limit recording power (Pth). The optimum recording power (Pwo) is calculated using the limit recording power (Pth) and the power multiplication factors ρ and κ. Here, κ, ρ, and Pind are the OPC parameters, and the result of reading out those recorded in advance in the disk management area is used. The optimum recording power (Pwo) is calculated by the equation Pwo = ρ × κ × Pth, and the calculation result is the optimum recording power Pwo of the information recording layer.

Next, the calculation unit checks whether or not the optimum recording power obtained in the OPC-A area is the optimum power that should be obtained originally. In the operation procedure for obtaining the optimum recording power, the optimum recording power (Pwoi) obtained in the OPC-A area of the i-th layer using the optical disc apparatus and the recording power originally determined by the optical disc manufacturer at the time of disc creation. The recommended recording power (Pwpi) of the i-th layer is compared, and when the optimum recording power is, for example, 5% or more larger than the recommended recording power (Pwpi) (Pwoi / Pwpi-1 ≧ 5%) It is determined that the recording power (Pwoi) is inappropriate, and the write strategy is changed again, or the above-described OPC procedure is performed again with the write strategy as it is, and the optimum recording power (Pwoi) is obtained again.

In the eighth embodiment, the method of obtaining the optimum value of the recording power by measuring the modulation degree of the signal recorded with a plurality of recording powers has been described. However, the method of obtaining the optimum power is a method of obtaining from the modulation degree. In addition to the above, a method may be used in which one or more of other signal indicators such as β, jitter, asymmetry, and MLSE are measured and measured. Also, when obtaining the optimum recording power using the modulation degree, in addition to the method for obtaining the optimum value of the recording power from the product of the modulation degree and the recording power, the product of the nth power of the recording power of the modulation degree is used. The optimum value of the recording power may be obtained using the n · κ method.

Next, the operation of preparing for performing test recording on the j-th layer which is an information recording layer other than the i-th information will be described. A ratio α (= Pwoi / Pwpi) between the optimum recording power (Pwoi) of the i-th information recording layer and the recommended recording power (Pwpi) is obtained, and the recommended recording power (Pwpi) of the j-th information recording layer is The optimum recording power (Pwyj) predicted for the information recording layer of j is calculated by the following equation.
(Pwyj) = (Pwpj) × α

Next, the system control unit 121 instructs the recording power control unit 116 to perform test recording in the OPC-B area of the j-th information recording layer and obtain the optimum recording power and recording pulse condition of the j-th layer. At the time of test recording, test recording is performed with a plurality of recording powers equal to or less than the upper limit recording power (Pwmaxj), and the reproduction signal detection unit 117 determines the modulation degree characteristic of the reproduction signal of the RF signal output from the RF signal generation unit 113. taking measurement.

The calculation unit 119 obtains the optimum recording power (Pwoj) of the jth information recording layer. After the optimum recording power (Pwoj) of the jth information recording layer is determined, test recording is performed on the OPC-B area of the jth information recording layer with the optimum recording power (Pwoj), and the recording pulse condition (write strategy condition) Find the optimal value. Thus, the test recording on the jth information recording layer is completed. Although omitted here, the system control unit 121 may perform a process of checking whether the obtained optimum recording power (Pwoj) is the optimum recording power that should be obtained.

The system control unit 121 checks whether test recording of all information recording layers is completed. If test recording has not been completed for all information recording layers, test recording is performed again for the remaining information recording layers, and optimum values of recording power and write strategy are obtained. If test recording has been completed for all information recording layers, test recording completion processing is performed. That is, the system control unit instructs the recording power setting unit to update the Next Available PSN information of the DMA, performs recording on the DMA, and the recording operation is completed.

The optimum recording power obtained by performing test recording with the optical disc recording / reproducing apparatus or the upper limit value of recording power to be recorded in the OPC-B area, or the optimum modulation power and the recording pulse condition as the upper limit value of the recording power. Such information may be added to the DMA in the inner area 1002 or other predetermined area. By doing so, the recording power and the recording pulse condition are corrected without performing an unnecessary adjustment step at the next activation according to the characteristics of the optical information recording medium. As a result, the adjustment time can be shortened, and the signal quality of the recording mark can be improved efficiently.

In the embodiment of the present invention, an optical recording / reproducing apparatus and a write-once optical disc have been described as examples. However, the present invention is not limited to this, and is effective for a rewritable optical disc.

In the embodiment of the present invention, the upper limit of the recording power to be recorded in the OPC-B area is set. The recording power is generally the peak level power when the laser beam is pulse-modulated. Depending on the pulse, an upper limit value may be set for a power level lower than the recording power, such as intermediate power, space power, erase power, bottom power, cooling power, and the like. Also, a plurality of upper limit values of recording power can be set according to the speed of the optical disc at the time of recording. Specifically, in the case of an optical disc capable of recording at double speed (2x) and quadruple speed (4x), 2x and 4x may have different upper limits of recording power.

(Embodiment 9)
Next, a servo condition adjustment procedure including test recording on the multilayer optical information recording medium according to the ninth embodiment of the present invention will be described with reference to the drawings. The multilayer optical disk will be described by taking the physical format of the multilayer optical disk used in the first embodiment of the present invention as an example, but the multilayer optical disk may be applied to the physical format of the multilayer optical disk described in the second, third, and fourth embodiments. Good.

Primarily, the adjustment procedure for servo-related items such as radial tilt, tangential tilt, focus offset, tracking offset, and spherical aberration will be described.

Radial tilt and tangential tilt are tilts determined by the optical axis and the traveling direction of the spot, and the tilt is adjusted so that the light spot is perpendicularly incident on the information recording surface of the optical disc. If the recording surface of the optical disc has a tilt, coma aberration occurs, and it is difficult to record and reproduce a high-quality signal on the optical disc. Therefore, it is necessary to accurately detect and correct the tilt angle between the disk and the optical axis of the laser beam before recording and reproducing signals on the optical disk.

Further, in the case of an optical disc having a plurality of information recording layers, when a light spot is condensed on each information recording layer, the thickness from the laser beam incident surface to the information recording surface is different for L0, L1, L2, and L3. Spherical aberration occurs depending on the incident thickness. It is necessary to adjust the spherical aberration to the optimum condition for each information recording layer.

In order to increase the reliability of the optical disk system, it is necessary to adjust the servo conditions to record and reproduce high quality signals. There are methods to adjust the servo conditions using the initial values of the servo conditions set in advance in the optical disk device. However, depending on the type of optical disk, the eccentricity of each disk, thickness variation, tilt, variation in the mounting accuracy of the optical disk device, etc. Signals with good quality can be recorded and reproduced by individually adjusting the initial values of servo conditions set in advance at the factory. The servo condition adjustment procedure is a tracking error signal generated from reflected light from a groove track formed in advance with the laser beam focused on a desired information recording layer when the optical disk is loaded into the apparatus. Is detected by the servo control unit 112, and the radial tilt, tangential tilt, focus offset, and spherical aberration correction value are adjusted so that the amplitude of the tracking error signal is maximized.

The actuator 107 in FIG. 1 uses a servo control unit 112 to perform focus control, which is position control of the objective lens 105 in the optical axis direction, and tracking control, which is position control perpendicular to the light beam traveling direction. And is controlled by driving a driving means such as a coil or a magnet. The spherical aberration correction unit 108 drives the collimating lens 104 to perform optimal spherical aberration correction according to the thickness from the surface of each information layer. The servo condition of the rewritable or write-once optical disk is adjusted by detecting the tracking error signal generated by the reflected light from the recording track of the optical disk while the servo condition is changed. Adjust radial tilt, tangential tilt, and focus offset to maximize.

In order to adjust the servo conditions with higher accuracy, the recorded track recorded in the past is searched based on the OPC area management information of the DMA, the desired recorded track is reproduced, and the RF generated from the reflected light is retrieved. The reproduction signal detector 117 reads the signal, measures the signal quality (jitter, MLSE, error rate, modulation factor, etc.) of the reproduction signal, and adjusts the servo conditions so that the measured signal quality is the best. As described above, by adjusting the servo condition using the tracking error signal and the RF signal, the servo condition can be set with higher accuracy, and the signal quality can be improved.

Also, in the case of an optical disc that has never been recorded, such as a blank disc, since there is no recorded track, the servo condition is adjusted by detecting the amplitude of the tracking error signal with the laser beam focused. Although it can be performed, the servo condition cannot be adjusted more accurately using the RF signal. Therefore, to adjust the servo conditions, learn the recording power and recording pulse conditions, determine the provisional recording power and provisional recording pulse conditions, create a test recording track to optimize the servo conditions under those conditions, Determine the optimal servo conditions. After the optimum servo condition is determined, the recording power and the recording pulse condition are further learned in the OPC area, and the optimum recording power and the optimum recording pulse condition are determined by the procedure described in the sixth embodiment of the present invention. A test recording track is created in the OPC area or DMA.

The servo condition adjustment procedure of this embodiment will be described with reference to the flowchart of FIG. The first step is a step of adjusting the first servo condition when the optical disc is loaded on the optical disc apparatus. When the optical disk is loaded on the optical disk apparatus, the servo control unit generates a tracking error signal generated from the reflected light from the groove track formed in advance on the optical disk in a state where the laser beam is focused on a desired information recording layer. The radial tilt, the tangential tilt, the focus offset, and the spherical aberration correction value are adjusted so that the amplitude of the tracking error signal is maximized. The tracking offset is adjusted so that the control loop is closed at the center of the amplitude of the push-pull signal. The above is performed for every information recording layer, and the adjustment of the first servo condition of each information recording layer is completed.

It should be noted that parameters such as radial tilt and tangential tilt that change not in the thickness of the information recording layer but in the radial position are not adjusted in all the information recording layers, but are determined in any one information recording layer. The adjustment in other information recording layers may be omitted by using the obtained value.

The second step is a step of determining whether or not the disc is a blank disc. The OPC area management information recorded in the DMA in the lead-in zone is read to check whether data is recorded in the DMA or OPC area. If a signal has been recorded in the past, the process proceeds to a sixth step to be described later. If a signal has not been recorded in the past (in the case of a blank disc), the process proceeds to the third step.

The third step is a procedure for obtaining provisional recording power and recording pulse condition of each information recording layer of L0, L1, L2, and L3 in the OPC area before adjusting the second servo condition. The first servo condition is set, and OPC is performed in the OPC-A area of L0 to determine the provisional recording power. Further, the recording pulse condition is adjusted in the OPC-A area, and a provisional value of the recording pulse condition is determined. A test recording track (A) is created in the OPC-A area with the above-described provisional recording power and provisional write strategy. Next, OPC is performed in the OPC-B area of L1, and provisional recording power is determined. Further, the recording pulse condition is adjusted in the OPC-B area, and a provisional value of the recording pulse condition is determined. A test recording track (A) is created in the OPC-B area with the above-described provisional recording power and provisional write strategy. Similarly, L2 and L3 determine the provisional recording power and provisional recording pulse conditions in the same procedure as L1, and create a test recording track (A) in the OPC-B area. Here, the test recording procedure for the OPC area is performed according to the procedure of the sixth embodiment described above, and provisional recording power and provisional recording pulse conditions are determined.

The fourth step is a step for adjusting the second servo condition. The test recording track (A) in the OPC area created in the third step is reproduced, and the servo conditions are adjusted. Servo conditions are adjusted by measuring the reproduction signal quality while changing the offset value of each servo condition, and reproducing signal quality (jitter, MLSE, error rate, modulation) of the RF signal generated by reproducing the test recording track (A). The servo condition is adjusted so that the reproduction signal quality is the best, and the best servo condition is determined. The above is performed for every information recording layer, and the adjustment of the second servo condition of each information recording layer is completed.

The fifth step is a step for adjusting the third servo condition. Servo condition adjustment measures the reproduction signal quality (jitter, MLSE, error rate, modulation factor, etc.) of the RF signal obtained by reproducing the track (C) recorded in the DMA while changing the set value of each servo condition. Then, the servo condition is determined so that the reproduction signal quality is the best. Servo adjustment is performed for every information recording layer, and adjustment of the third servo condition of each information recording layer is completed.

Although the servo condition was adjusted using the track (C) recorded in the DMA, the recording power and the recording pulse condition were adjusted for the signal recorded in the DMA instead of the test recording. Since recording is performed in a good state later, it is suitable for adjusting servo conditions with higher accuracy than the test recording track in the OPC area.

The recording track used for the third servo adjustment in the fifth step of this embodiment is the track (C) recorded in the DMA in the lead-in zone, and the optimum servo condition is determined. If the signal quality of the test recording track (B) recorded in the OPC-B area in the lead-in zone is good, adjust the servo conditions using the test recording track recorded in the OPC-B area. You may go.

Also, the servo condition may be adjusted using the track (C) recorded in both the inner and outer DMAs. Servo conditions determined separately for the inner and outer circumferences of the optical disc can be recorded and reproduced under good servo conditions in the radial direction of the optical disc by linear interpolation according to the radial position from the inner circumference to the outer circumference. Is possible.

In addition, in a read-only optical disk device called a player that cannot perform a write operation, when adjusting the servo conditions of the multilayer optical disk of the present invention, the recorded track recorded in the OPC area or DMA in the lead-in zone is used. Use to adjust servo conditions. The player's adjustment method corresponds to the case of not being a blank disc in the flowchart of FIG. 16, and the reproduction signal quality of the RF signal is measured while changing the servo condition using the recording track (C) recorded in advance. Determine the optimal servo conditions. If it is determined that the disc is a blank disc, it is determined that data to be reproduced is not recorded, and the subsequent processing is stopped.

調整 Adjusting the servo conditions within the inner lead-in zone has the following effects. When a cover layer or an intermediate layer of an optical disk is formed using a spin coating method or the like, thickness unevenness occurs from the inner periphery to the outer periphery. When the inner circumference of the optical disk is created with the specified accuracy, the servo conditions should be adjusted more accurately if the servo conditions are adjusted on the inner circumference where there is little variation in the thickness of the cover layer and the intermediate layer and the influence of the disc tilt. It is possible to adjust. If the optical disc has a thickness variation from the inner circumference to the outer circumference, servo adjustment is performed with the thickness within a certain standard on the inner circumference, and the thickness and tilt on the outer circumference are constant relative to the reference value on the inner circumference. The signal quality can be kept within a certain level by guaranteeing the design within the range.

Also, when the servo adjustment is performed in both the inner lead-in zone and the outer lead-out zone, it takes time for the optical pickup to seek from the inner track to the outer track. The seek time of the optical pickup can be shortened by adjusting the servo conditions in the lead-in zone on the inner circumference. Therefore, the start time can be shortened by collectively performing servo condition adjustment OPC, recording pulse condition adjustment, reading of disk management information, and the like in the inner lead-in zone.

In the multilayer optical discs used in Embodiments 1 to 9 of the present invention, the 0th information recording layer, which is the information recording layer located farthest from the laser light incident side of the optical disc, further extends to the back information recording layer. Therefore, it is not necessary to set an upper limit value of the recording power. Therefore, an upper limit value of the recording power may be provided only for the information recording layer on the near side of the first information recording layer. Therefore, in the 0th information recording layer (L0) of the multilayer optical disk used in Embodiments 1 to 9 of the present invention, the OPC-B area may be replaced with the OPC-A area. Further, as the start point of test recording, the OPC area of L0 and the OPC-A area of the information recording layer other than L0 may be used together as the start point of test recording.

In the first to ninth embodiments, the configuration in which the OPC-B areas are arranged on substantially the same radial position in each information recording layer has been described as an example. However, the OPC-B area of the present invention is excessive. Since the recording is not performed with the recording power, it is possible to replace the area with the area such as the DMA that is recorded with the appropriate power in the inner zone or the outer zone, and to dispose the radial positions. Further, the OPC-B area may be divided into two or more in each area of the inner zone or the outer zone in one information recording layer.

In the first to ninth embodiments, the embodiment in which two types of OPC areas are arranged in the inner zone has been described. However, the OPC area is not limited to the inner zone but may be in the outer zone. Further, it may be in both the inner zone and the outer zone, or in the case of a rewritable optical disc, a test recording area may be arranged in the data zone and erased with DC power after completion of the test recording.

Alternatively, either the OPC-A area or the OPC-B area may be arranged in the outer zone. By arranging the OPC area in both the inner zone and the outer zone, when performing high-speed recording such that the rotation speed of the spindle motor exceeds 10,000 rpm on the inner circumference, it is desired to limit the rotation speed in the inner zone on the inner circumference. When the test recording cannot be performed at the linear velocity, the rotation speed is less than half in the outer outer zone, so that the test recording can be performed, and the optimum recording power and the like can be learned on the outer periphery.

In the first to ninth embodiments of the present invention, the same optical pickup as that used in the BD is used, but the optical recording medium is irradiated with a beam and the beam is reflected from the optical recording medium. An optical pickup having any configuration may be used as long as it outputs a signal.

In the first to ninth embodiments, an example in which the information recording layer is laminated in four layers has been described with reference to the drawings. However, the present invention is not limited to four layers, but three or two layers, or Needless to say, the present invention can also be applied to a multilayer optical disc having a structure in which five or more layers are stacked.

(Main parameters)
As an example of a recording medium to which the present invention can be applied, there are a Blu-ray disc (BD) and other standard optical discs. Here, BD will be described. Depending on the characteristics of the recording film, there are types of BDs such as a BD-ROM which is a read-only type, a BD-R which is a write once / write once type, and a BD-RE which is a rewritable type. Is applicable to any type of recording medium of R (write-once type / write-once type) and RE (rewritable type) on BD and other standard optical discs. The main optical constants and physical formats of Blu-ray Discs can be found on the white papers posted on the Blu-ray Disc Reader (Ohm Publishing) and the Blu-ray Association website (http://www.blu-raydisc.com/). It is disclosed.

In the BD, the laser beam with a wavelength of about 405 nm (400 to 410 nm if the tolerance of the error range is ± 5 nm with respect to the standard value of 405 nm) and the numerical aperture (NA) is about 0.85 (standard value). If the tolerance of the error range is ± 0.01 with respect to 0.85, an objective lens of 0.84 to 0.86) is used. The track pitch of the BD is approximately 0.32 μm (0.310 to 0.330 μm if the tolerance of the error range is ± 0.010 μm with respect to the standard value of 0.320 μm), and the recording layer has one or two recording layers. Layers are provided. The recording layer has a single-sided or double-sided recording surface from the laser incident side, and the distance from the surface of the protective layer of the BD to the recording surface is 75 μm to 100 μm.

The recording signal modulation method uses 17PP modulation, and the mark of the shortest mark to be recorded (2T mark: T is the period of the reference clock (the reference period of modulation in the case of recording a mark by a predetermined modulation rule)) The length is 0.149 μm (or 0.138 μm) (channel bit length: T is 74.50 nm (or 69.00 nm)). The recording capacity is a single-sided single layer 25 GB (or 27 GB) (more specifically 25.005 GB (or 27.020 GB)) or a single-sided double layer 50 GB (or 54 GB) (more specifically 50.050 GB (or 54 .040 GB)).

The channel clock frequency is 66 MHz (channel bit rate 66.000 Mbit / s) at a transfer rate of standard speed (BD1x), 264 MHz (channel bit rate 264.000 Mbit / s) at a transfer rate of quadruple speed (BD4x), 6 The transfer rate at double speed (BD6x) is 396 MHz (channel bit rate 396.000 Mbit / s), and the transfer rate at 8 times speed (BD8x) is 528 MHz (channel bit rate 528.000 Mbit / s).

The standard linear velocity (reference linear velocity, 1x) is 4.917 m / sec (or 4.554 m / sec). The linear velocities of 2x (2x), 4x (4x), 6x (6x) and 8x (8x) are 9.834 m / sec, 19.668 m / sec, 29.502 m / sec and 39.50, respectively. 336 m / sec. The linear velocity higher than the standard linear velocity is generally a positive integer multiple of the standard linear velocity, but is not limited to an integer and may be a positive real multiple. Also, a linear velocity that is slower than the standard linear velocity, such as 0.5 times (0.5x), may be defined.

The above is about commercialization, mainly about 1GB or 2GB BD of about 25GB per layer (or about 27GB). A high-density BD having a capacity of approximately 32 GB or approximately 33.4 GB and a BD having a number of layers of three or four have been studied, and these will be described below.

(About multilayer)
When a single-sided disk on which information is reproduced and / or recorded by entering laser light from the side of the protective layer, a plurality of recording layers are provided between the substrate and the protective layer when the number of recording layers is two or more. In this case, FIG. 19 shows a general configuration example of the multilayer disk in that case. The illustrated optical disc is composed of (n + 1) information recording layers 502 (n is an integer of 0 or more). Specifically, the configuration is such that a cover layer 501, (n + 1) information recording layers (Ln to L0 layers) 502, and a substrate 500 are laminated on the optical disc in order from the surface on the side where the laser beam 505 is incident. Has been. Further, an intermediate layer 503 serving as an optical buffer material is inserted between (n + 1) information recording layers 502. That is, recording is performed such that the reference layer (L0) is provided at the farthest position (the furthest position from the light source) at a predetermined distance from the light incident surface, and the layers are increased from the reference layer (L0) to the light incident surface side. The layers are stacked (L1, L2,..., Ln).

Here, when compared with a single-layer disc, the distance from the light incident surface to the reference layer L0 in the multilayer disc is substantially the same as the distance from the light incident surface to the recording layer in the single-layer disc (for example, about 0.1 mm). May be. In this way, regardless of the number of layers, the distance to the innermost layer (the farthest layer) is made constant (that is, the same distance as in the case of a single layer disc), regardless of whether it is a single layer or multiple layers. Compatibility regarding access to the reference layer can be maintained. In addition, it is possible to suppress an increase in tilt effect accompanying an increase in the number of layers. The increase in tilt effect can be suppressed because the innermost layer is most affected by tilt, but the number of layers increases by making the distance to the innermost layer the same distance as a single-layer disc. This is because the distance to the innermost layer does not increase.

In addition, regarding the traveling direction of the spot (also referred to as a track direction or a spiral direction), it may be a parallel path or an opposite path.

In the parallel path, the playback direction is the same in all layers. That is, the traveling direction of the spot proceeds from the inner periphery to the outer periphery in all layers, or from the outer periphery to the inner periphery in all layers.

On the other hand, in the opposite pass, the playback direction is reversed between a layer and a layer adjacent to the layer. That is, when the reproduction direction in the reference layer (L0) is a direction from the inner periphery to the outer periphery, the reproduction direction in the recording layer L1 is a direction from the outer periphery to the inner periphery, and in the recording layer L2, the inner layer is directed to the outer periphery. Direction. That is, the reproducing direction is the direction from the inner periphery to the outer periphery in the recording layer Lm (m is 0 and an even number), and the direction from the outer periphery to the inner periphery in the recording layer Lm + 1. Alternatively, the recording layer Lm (m is 0 and an even number) is a direction from the outer periphery to the inner periphery, and the recording layer Lm + 1 is a direction from the inner periphery to the outer periphery.

The thickness of the protective layer (cover layer) is set to be thinner so that the focal length becomes shorter as the numerical aperture NA increases, and the influence of spot distortion due to tilt can be suppressed. The numerical aperture NA is set to 0.45 for CD, 0.65 for DVD, and approximately 0.85 for BD. For example, of the total thickness of the recording medium of about 1.2 mm, the protective layer may have a thickness of 10 to 200 μm. More specifically, on a substrate of about 1.1 mm, a transparent protective layer of about 0.1 mm for a single layer disc, and an intermediate layer (SpacerLayer of about 0.025 mm on a protective layer of about 0.075 mm for a dual layer disc. ) May be provided. If the disc has three or more layers, the thickness of the protective layer and / or the intermediate layer may be further reduced.

(Each structural example of 1 to 4 layers)
Here, FIG. 20 shows a configuration example of a single-layer disc, FIG. 21 shows a configuration example of a two-layer disc, FIG. 22 shows a configuration example of a three-layer disc, and FIG. 23 shows a configuration example of a four-layer disc. As described above, when the distance from the light irradiation surface to the reference layer L0 is constant, the total thickness of the disk is approximately 1.2 mm in any of FIGS. The thickness of the substrate 500 is approximately 1.1 mm, and the distance from the light irradiation surface to the reference layer L0 is approximately 0.1 mm. In the single-layer disc of FIG. 20 (when n = 0 in FIG. 19), the cover layer 5011 has a thickness of approximately 0.1 mm, and in the dual-layer disc of FIG. 21 (when n = 1 in FIG. 19) The cover layer 5012 has a thickness of approximately 0.075 mm, the intermediate layer 5302 has a thickness of approximately 0.025 mm, and the three-layer disc in FIG. 22 (when n = 2 in FIG. 19) or the four-layer disc in FIG. 19 (when n = 3), the thickness of the cover layers 5013 and 5014 and / or the thickness of the intermediate layers 5303 and 5304 is further reduced.

(Optical disk manufacturing method)
These single-layer or multi-layer discs (discs having k recording layers, k is an integer of 1 or more) can be manufactured by the following process.

In other words, information can be reproduced by irradiating a laser with a wavelength of 400 nm or more and 410 nm or less onto a substrate having a thickness of approximately 1.1 mm through an objective lens having a numerical aperture of 0.84 or more and 0.86 or less. K recording layers are formed.

Next, k-1 intermediate layers are formed between the recording layers. In the case of a single-layer disc, k = 1, so k-1 = 0 and no intermediate layer is formed.

Next, a protective layer having a thickness of 0.1 mm or less is formed on the kth recording layer counted from the substrate side (in the case of a multilayer disc, the recording layer farthest from the substrate).

In the step of forming the recording layer, when the i-th recording layer (i is an odd number of 1 or more and k or less) counted from the substrate side, the reproducing direction is changed from the inner periphery side to the outer periphery side of the disc. Concentric or spiral tracks are formed so as to be in the directions. Further, when the jth recording layer (j is an even number not less than 1 and not more than k) from the substrate side is formed, it is concentric so that the reproducing direction is the direction from the outer peripheral side to the inner peripheral side of the disc. Alternatively, a spiral track is formed. In the case of a single-layer disc, k = 1, and therefore, there is only “1” as i which is an odd number satisfying 1 or more and k or less at k = 1. Therefore, one recording layer is used as the i-th recording layer. In addition, since there is no j that is an even number satisfying 1 or more and k or less at k = 1, the j-th recording layer is not formed.

The various areas described above can be assigned to the tracks in the recording layer.

(Optical disk playback device)
Such a single-layer or multi-layer disc (a disc having k recording layers, k is an integer of 1 or more) is reproduced by a reproducing apparatus having the following configuration.

The structure of the disk is as follows: a substrate having a thickness of approximately 1.1 mm, k recording layers on the substrate, and k-1 intermediate layers between the recording layers (a single layer) In the case of a disc, since k = 1, k−1 = 0 and there is no intermediate layer.) On the kth recording layer (the recording layer farthest from the substrate in the case of a multilayer disc) And a protective layer having a thickness of 0.1 mm or less. A track is formed in each of the k recording layers, and various areas can be assigned to at least one of the tracks.

Then, from the surface side of the protective layer, through the objective lens having a numerical aperture of 0.84 or more and 0.86 or less, k recording layers are formed by an optical head that irradiates a laser having a wavelength of 400 nm or more and 410 nm or less. Information can be reproduced from each.

In the i-th recording layer (i is an odd number from 1 to k) counted from the substrate side, concentric or spiral tracks are formed, and reproduction is performed from the inner circumference side to the outer circumference side of the disc. By controlling the reproduction direction by the control unit, information can be reproduced from the i-th recording layer.

In the j-th recording layer (j is an odd number from 1 to k) counted from the substrate side, concentric or spiral tracks are formed, and reproduction is performed from the outer peripheral side to the inner peripheral side of the disc. By controlling the reproducing direction by the control unit, information can be reproduced from the jth recording layer.

(In-Groove / On-Grove)
As for the recording method, by forming a groove in the medium, a groove portion and an inter-groove portion between the grooves are formed. There are various methods, such as recording in the groove portion or between the groove portion and the groove portion. Here, a method of recording on the side which becomes the convex portion when viewed from the light incident surface among the grooves and the inter-groove portion is called an On-Groove method, and a method of recording on the side which becomes the concave portion from the light incident surface is the In-Groove method. It is called a method. In the present invention, it does not matter whether the recording method is an On-Groove method, an In-Groove method, or a method that permits either one of the two methods.

In the case of a method that permits either one of the two methods, it indicates whether the medium is an On-Groove method or an In-Groove method so that the recording method of the medium can be easily identified. The recording method identification information may be recorded on the medium. For a multilayer medium, recording method identification information for each layer may be recorded. In that case, the recording method identification information for each layer is the reference layer (the layer farthest from the light incident surface (L0) or the nearest layer, the layer that is determined to be accessed first at the time of startup, etc.) ), Recording method identification information relating to only that layer may be recorded in each layer, or recording method identification information relating to all layers may be recorded in each layer.

The recording system identification information is recorded in an area such as a BCA (Burst Cutting Area) or a disc information area (inside or outside of the data recording area, mainly storing control information, a read-only area). The track pitch may be wider than the data recording area) and wobble (recording superimposed on the wobble), etc., and even if it is recorded in any area, any area or all areas Good.

Also, regarding the wobble start direction, the On-Groove method and the In-Groove method may be reversed. In other words, if the on-groove method starts the wobble start direction from the inner periphery side of the disc, the in-groove method starts the wobble start direction from the outer periphery side of the disc (or if In the case of the on-groove method, when the wobble start direction starts from the outer peripheral side of the disc, the wobble start direction may be started from the inner peripheral side of the disc in the in-groove method). Thus, by making the wobble start directions opposite to each other in the On-Groove method and the In-Groove method, the tracking polarity can be made the same in either method. This is because recording is performed from the light incident surface to the convex side in the On-Groove method, whereas recording is performed from the light incident surface to the concave side in the In-Groove method. If the depths of the two are the same, the tracking polarities have an inverse relationship. Therefore, the tracking polarities can be made the same by making the wobble start directions opposite to each other.

(High to Low / Low to High)
Further, regarding the characteristics of the recording film, there are the following two characteristics depending on the reflectance relationship between the recorded portion and the unrecorded portion. That is, the HtoL characteristic in which the unrecorded part has a higher reflectance (High-to-Low) than the recorded part, and the LtoH characteristic in which the unrecorded part has a lower reflectance (Low-to-High) than the recorded part. It is. In the present invention, it does not matter whether the recording film characteristic of the medium is HtoL or LtoH, and either one is permitted.

In the case where one of them is permitted, recording film characteristic identification information indicating whether the recording film characteristic is HtoL or LtoH can be recorded on the medium so that the recording film characteristic can be easily identified. Good. For multilayer media, recording film characteristic identification information for each layer may be recorded. In that case, the recording film characteristic identification information for each layer is the reference layer (the most distant layer (L0) as viewed from the light incident surface or the closest layer, or the layer that is determined to be accessed first at the start). Etc.), recording film characteristic identification information relating to only that layer may be recorded in each layer, or recording film characteristic identification information relating to all layers may be recorded in each layer.

In addition, the recording film characteristic identification information is recorded in an area such as a BCA (Burst Cutting Area) or a disk information area (inner side or / and outer side of the data recording area, mainly storing control information, but also reproducing) (There may be a track pitch wider than the data recording area in the dedicated area) and wobble (recorded superimposed on the wobble), etc., and recorded in any area, any area or all areas May be.

If the recording density is improved, there is a possibility that a plurality of types of recording density of the optical disk medium exist. In this case, regarding the various formats and methods described above, only a part of them may be adopted or a part of them may be changed to another format or method according to the recording density.

FIG. 24 shows a physical configuration of the optical disc 1 according to the present embodiment. A disk-shaped optical disk 1 has a large number of tracks 2 formed, for example, concentrically or spirally, and each track 2 has a large number of finely divided sectors. As will be described later, data is recorded in each track 2 in units of blocks 3 having a predetermined size.

The optical disc 1 according to the present embodiment has a larger recording capacity per information recording layer than a conventional optical disc (for example, a 25 GB BD). The expansion of the recording capacity is realized by improving the recording linear density, for example, by reducing the mark length of the recording mark recorded on the optical disc. Here, “to improve the recording linear density” means to shorten the channel bit length. The channel bit is a length corresponding to the period T of the reference clock (the reference period T of modulation when a mark is recorded by a predetermined modulation rule). The optical disk 1 may be multilayered. However, in the following, only one information recording layer is mentioned for convenience of explanation. Further, in the case where a plurality of information recording layers are provided, even when the width of the track provided in each information recording layer is the same, the mark length differs for each layer, and the mark length is uniform in the same layer. Therefore, the recording linear density may be different for each layer.

Track 2 is divided into blocks for each data recording unit of 64 kB (kilobytes), and block address values are assigned in order. The block is divided into sub-blocks of a predetermined length, and one block is constituted by three sub-blocks. Subblock numbers 0 to 2 are assigned to the subblocks in order from the front.

(About recording density)
Next, the recording density will be described with reference to FIGS. 25, 26 and 27. FIG.

FIG. 25 (a) shows an example of a 25 GB BD. In BD, the wavelength of the laser 123A is 405 nm, and the numerical aperture (NA) of the objective lens 220A is 0.85.

Like DVD, recording data is recorded as a physical

change mark row

120A, 121A on the track 2 of the optical disc in the BD. The shortest mark in the mark row is called the “shortest mark”. In the figure, the mark 121A is the shortest mark.

In the case of a 25 GB recording capacity, the physical length of the shortest mark 121A is 0.149 μm. This is equivalent to approximately 1 / 2.7 of DVD, and even if the wavelength parameter (405 nm) and NA parameter (0.85) of the optical system are changed to increase the resolution of the laser, the light beam identifies the recording mark. We are approaching the limit of optical resolution that is possible.

FIG. 26 shows a state in which a mark row recorded on a track is irradiated with a light beam. In BD, the light spot 30 is about 0.39 μm due to the optical system parameters. When the recording line density is improved without changing the structure of the optical system, the recording mark becomes relatively small with respect to the spot diameter of the light spot 30, so that the reproduction resolution is deteriorated.

For example, FIG. 25 (b) shows an example of an optical disc having a higher recording density than a 25 GB BD. Also in this disk, the wavelength of the laser 123A is 405 nm, and the numerical aperture (NA) of the objective lens 220A is 0.85. Of the

mark rows

125A and 124A of the disc, the physical length of the shortest mark 125A is 0.11175 um. Compared with FIG. 25A, the spot diameter is the same, about 0.39 μm, but the recording mark becomes relatively small and the mark interval is also narrowed, so that the reproduction resolution is deteriorated.

The amplitude of the reproduction signal when the recording mark is reproduced with the light beam decreases as the recording mark becomes shorter, and becomes zero at the limit of optical resolution. The reciprocal of the recording mark period is called a spatial frequency, and the relationship between the spatial frequency and the signal amplitude is called OTF (Optical-Transfer-Function). The signal amplitude decreases almost linearly as the spatial frequency increases. The limit frequency of reproduction at which the signal amplitude becomes zero is called OTF cut-off.

FIG. 27 is a graph showing the relationship between the OTF and the shortest recording mark in the case of a 25 GB recording capacity. The spatial frequency of the shortest mark of the BD is about 80% with respect to the OTF cutoff, and is close to the OTF cutoff. It can also be seen that the amplitude of the reproduction signal of the shortest mark is very small, about 10% of the maximum detectable amplitude. When the spatial frequency of the shortest mark on the BD is very close to the OTF cutoff, that is, when the reproduction amplitude hardly appears, the recording capacity in the BD corresponds to about 31 GB. When the frequency of the reproduction signal of the shortest mark is in the vicinity of or exceeding the OTF cutoff frequency, the resolution of the laser may be limited or exceeded, and the reproduction amplitude of the reproduction signal becomes small. This is a region where the S / N ratio deteriorates rapidly.

For this reason, the recording linear density of the high recording density optical disk in FIG. 25 (b) is the case where the frequency of the shortest mark of the reproduction signal is near the OTF cutoff frequency (the OTF cutoff frequency is below or below the OTF cutoff frequency). In this case, it can be assumed that the frequency is higher than the OTF cutoff frequency.

FIG. 28 is a graph showing an example of the relationship between the signal amplitude and the spatial frequency when the spatial frequency of the shortest mark (2T) is higher than the OTF cutoff frequency and the amplitude of the 2T reproduction signal is 0. It is. In FIG. 28, the 2T spatial frequency of the shortest mark length is 1.12 times the OTF cutoff frequency.

(Relationship between wavelength, numerical aperture, and mark length)
The relationship among the wavelength, numerical aperture, and mark length / space length in the high recording density disk B is as follows.

When the shortest mark length is TMnm and the shortest space length is TSnm, and (shortest mark length + shortest space length) is represented by "P", P is (TM + TS) nm. In the case of 17 modulation, P = 2T + 2T = 4T. Laser wavelength λ (405 nm ± 5 nm, ie, 400 to 410 nm), numerical aperture NA (0.85 ± 0.01, ie, 0.84 to 0.86), shortest mark + shortest space length P (shortest length in the case of 17 modulation) Is 2T, so using three parameters P = 2T + 2T = 4T)
P ≤ λ / 2NA
If the reference T becomes smaller until ## EQU3 ## the spatial frequency of the shortest mark exceeds the OTF cutoff frequency.

The reference T corresponding to the OTF cutoff frequency when NA = 0.85 and λ = 405 is
T = 405 / (2 × 0.85) /4=59.558 nm
(Conversely, when P> λ / 2NA, the spatial frequency of the shortest mark is lower than the OTF cutoff frequency).

Thus, even if the recording linear density is increased, the SN ratio is deteriorated due to the limit of the optical resolution. Therefore, the SN ratio deterioration due to the multilayer information recording layer may be unacceptable from the viewpoint of the system margin. In particular, as described above, the S / N ratio deterioration becomes remarkable when the frequency of the shortest recording mark exceeds the OTF cutoff frequency.

In the above description, the recording density is described by comparing the frequency of the reproduction signal of the shortest mark with the OTF cutoff frequency. However, when the density is further increased, the next shortest mark (and the shortest one after another). Based on the same principle as described above, the recording density (recording line density, recording capacity) corresponding to the frequency of the reproduction signal of the mark (and the recording mark more than the next shortest mark) and the OTF cutoff frequency is used. May be set.

(Recording density and number of layers)
Here, as a specific recording capacity per layer in a BD having specifications such as a wavelength of 405 nm and a numerical aperture of 0.85, when the spatial frequency of the shortest mark is near the OTF cutoff frequency, for example, approximately 29 GB (for example, 29.0 GB ± 0.5 GB, or 29 GB ± 1 GB, etc.) or more, or about 30 GB (for example, 30.0 GB ± 0.5 GB, or 30 GB ± 1 GB, etc.) or more, or about 31 GB (for example, For example, 31.0 GB ± 0.5 GB or 31 GB ± 1 GB or more) or more, or approximately 32 GB (for example, 32.0 GB ± 0.5 GB or 32 GB ± 1 GB etc.) or more is assumed. Is possible.

The recording capacity per layer when the spatial frequency of the shortest mark is equal to or higher than the OTF cutoff frequency is, for example, approximately 32 GB (for example, 32.0 GB ± 0.5 GB or 32 GB ± 1 GB) or more, or more Approximately 33 GB (for example, 33.0 GB ± 0.5 GB, or 33 GB ± 1 GB) or more, or approximately 33.3 GB (for example, 33.3 GB ± 0.5 GB, or 33.3 GB ± 1 GB) or more Or approximately 33.4 GB (for example, 33.4 GB ± 0.5 GB, or 33.4 GB ± 1 GB) or more, or approximately 34 GB (for example, 34.0 GB ± 0.5 GB, or 34 GB ± 1 GB), or more More than or approximately 35 GB (for example, 35.0 GB ± 0.5 GB, or 35 GB ± 1 GB or the like) or more.

In particular, when the recording density is about 33.3 GB, a recording capacity of about 100 GB (99.9 GB) can be realized with three layers, and when about 33.4 GB, a recording capacity of 100 GB or more (100.2 GB) with three layers is achieved. realizable. This is almost the same as the recording capacity when the 25 GB BD has four layers. For example, when the recording density is 33 GB, 33 × 3 = 99 GB and the difference from 100 GB is 1 GB (1 GB or less), and when 34 GB is set, 34 × 3 = 102 GB and the difference from 100 GB is 2 GB (2 GB or less), 33.3 GB. In this case, when 33.3 × 3 = 99.9 GB and the difference from 100 GB is 0.1 GB (0.1 GB or less) and 33.4 GB, 33.4 × 3 = 100.2 GB and the difference from 100 GB is 0.2 GB (0 .2 GB or less).

Note that if the recording density is greatly expanded, precise reproduction becomes difficult due to the influence of the reproduction characteristic of the shortest mark, as described above. Therefore, about 33.4 GB is practical as a recording density that achieves 100 GB or more while suppressing a significant expansion of the recording density.

Here, the choice of whether the disk configuration is a four-layer structure of 25 GB per layer or a three-layer structure of 33 to 34 GB per layer occurs. Multi-layering is accompanied by a decrease in reproduction signal amplitude (deterioration of SN ratio) in each recording layer, influence of multi-layer stray light (signal from an adjacent recording layer), and the like. Therefore, by using a 33-34 GB three-layer disc instead of a 25 GB four-layer disc, the influence of such stray light is suppressed as much as possible, that is, with a smaller number of layers (three layers instead of four layers), about It becomes possible to realize 100 GB. Therefore, a disc manufacturer who wants to achieve about 100 GB while avoiding multi-layering as much as possible can select three layers of 33 to 34 GB. On the other hand, a disc manufacturer who wants to realize about 100 GB with the conventional format (recording density 25 GB) can select 25 GB of four layers. In this manner, manufacturers having different purposes can realize the respective purposes by using different configurations, and can give a degree of freedom in designing the disc.

Also, if the recording density per layer is about 30 to 32 GB, a 3-layer disc does not reach 100 GB (about 90 to 96 GB), and a 4-layer disc can achieve 120 GB or more. Of these, if the recording density is about 32 GB, a recording capacity of about 128 GB can be realized with a four-layer disc. The number 128 is also a numerical value that matches the power of 2 (2 to the 7th power), which is convenient for processing by a computer. Compared to a recording density that achieves about 100 GB on a three-layer disc, the reproduction characteristic for the shortest mark is not stricter.

For this reason, when expanding the recording density, by providing a plurality of types of recording densities (for example, approximately 32 GB and approximately 33.4 GB, etc.), a combination of a plurality of types of recording densities and the number of layers can be used for disc manufacturers. Thus, it is possible to give design freedom. For example, a manufacturer who wants to increase the capacity while suppressing the influence of multilayering is given an option to manufacture a three-layer disc of about 100 GB by making three layers of 33 to 34 GB, while suppressing the influence on the reproduction characteristics. For a manufacturer who wants to increase the capacity, an option of manufacturing a four-layer disc of about 120 GB or more by forming four layers of 30 to 32 GB can be given.

As described above, the information recording medium of the present invention is an information recording medium including a plurality of information recording layers of three or more layers, and each of the plurality of information recording layers is for adjusting recording conditions. A test recording area to be used, and one information recording layer of the plurality of information recording layers includes a reproduction-only management data area in which management data for managing the information recording medium is recorded in advance, Each of the other two or more information recording layers of the plurality of information recording layers includes the test recording area in which a radial position overlaps a part of the management data area.

The recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, wherein the plurality of information recording layers are pre-recorded in an irradiation unit for irradiating the plurality of information recording layers and the reproduction-only management data area. A recording unit that reproduces the management data and records information on the information recording medium based on the management data.

According to an embodiment, the multilayer optical information recording medium of the present invention is a multilayer optical information recording medium having a plurality of information recording layers, and the multilayer optical information recording medium is at a radial position. Accordingly, each of the information recording layers includes an inner zone, a data zone, and an outer zone from the inner periphery, and the plurality of information recording layers of the multilayer optical information recording medium include a first information recording layer, 2nd to Nth information recording layers (N is an integer of 2 or more) provided on the laser light incident side of the first information recording layer and sequentially arranged from the side closer to the first information recording layer And at least one of the first to Nth information recording layers includes a read-only management data area (control data area) formed at the time of disc creation, and records and / or records data. Also Of the test recording areas (OPC-A area and OPC-B area) which are classified into at least two types for recording the conditions for reproduction, at least one type of test recording area is defined as the inner zone and the outer zone. Are provided in the first to Nth information recording layers in at least one zone, and an upper limit value of recording power for test recording is set in the OPC-B area.

Further, according to an embodiment, the OPC-B area performs test recording after test recording in the OPC-A area of any one of the first to Nth information recording layers.

Further, according to an embodiment, the upper limit value of the OPC-B area is an optimum recording power obtained in the OPC-A area of at least one of the first to Nth information recording layers. And the upper limit value of the OPC-B area is set based on the ratio to the recommended recording power recorded in advance in the management data area.

According to an embodiment, of the first to Nth information recording layers, a part of the OPC-A region of the Mth (M is an integer of 1 to N) to the Nth information recording layer. Alternatively, all of them are provided so as to overlap physically substantially the same radial position.

Also, according to an embodiment, the M is M = 1 or M = 2.

Further, according to an embodiment, a part or all of a physical radius position of the management data (control data) area is arranged to overlap the OPC-B area.

According to an embodiment, the physical size of the test recording area of the first information recording layer is larger than the physical size of the OPC-A area of each of the second to Nth information recording layers. .

Further, according to an embodiment, the physical size of the OPC-B area is larger than the physical size of the OPC-A area in the same information recording layer.

Further, according to an embodiment, an upper limit value of recording power for test recording in the OPC-B area is recorded in advance in the management data area.

Further, according to an embodiment, an upper limit value of a modulation degree that can be recorded in the OPC-B area or a modulation degree of a recommended recording power is recorded in advance in the management data area.

According to an embodiment, the multilayer optical information recording medium is a write-once optical disc.

Further, according to an embodiment of the present invention, in the recording method for a multilayer optical information recording medium, the multilayer optical information recording medium includes a plurality of information recording layers, and each of the information recording layers corresponds to a radial position. Consists of an inner zone, an inner zone, a data zone, and an outer zone, and the plurality of information recording layers are provided on the laser light incident side from the first information recording layer and the first information recording layer, And second to Nth information recording layers (N is an integer of 2 or more) arranged in order from the side closer to the first information recording layer, and at least one of the first to Nth information recording layers Each information recording layer includes a read-only management data area (control data area) formed at the time of disc creation and a management data area (DMA) that can be additionally written or rewritten, and records and / or records data. Out of the test recording areas that are classified into at least two types (OPC-A area and OPC-B area) for test recording of the conditions at the time of generation, the inner zone and the outer zone Are provided in the first to Nth information recording layers in at least one zone, and an upper limit value of recording power for test recording is set in the OPC-B area. The recording method includes a step of reading a recommended power recorded at the time of disc creation from the control data area, a step of reading OPC area management information from the DMA, and a recordable OPC-A area from the OPC area management information. Determining the i-th (i is an integer from 1 to N) information recording layer, performing test recording in the OPC-A area of the i-th information recording layer, and determining the optimum of the i-th information recording layer A step of determining a recording power; a ratio (α) between the optimum power of the i-th information recording layer and the recommended recording power is calculated, and a prediction optimum that is an estimated optimum power of information recording layers other than the i-th information recording layer The recording power is calculated, and the upper limit value of the recording power when performing test recording to the OPC-B area of the information recording layer other than the i-th information is calculated from the predicted optimum recording power. And the OPC-B area of any one of the information recording layers other than the i-th information recording layer (j ≠ i and j is an integer from 1 to N) is less than or equal to the upper limit value. Test recording with a recording power, and determining an optimum power of the j-th information recording layer.

According to an embodiment, the optimum recording power obtained in the OPC-A area of the i-th information recording layer, which is at least one information recording layer among the first to N-th information recording layers, From the calculated value obtained by calculating the ratio (α) with the recommended recording power recorded in advance in the management data area, the following formula (1)
Predicted optimal power of the j-th layer = α × recommended recording power of the j-th layer × X (1)
Based on the calculated value, the upper limit value of the OPC-B area is set.

Also, according to an embodiment, the X is 1.1.

Further, according to an embodiment, the test recording order of the OPC-A area arranged in each information recording layer is positioned on the far side of the laser incident light in the recordable OPC-A area. Recording is sequentially performed from a layer to be performed to a layer located near the laser incident light.

According to an embodiment, the order of test recording between the layers of the OPC-B area arranged in each information recording layer can record the recordable OPC-B areas in an arbitrary order. It is.

Also, according to an embodiment, the optical information recording medium having the plurality of information recording layers is a write-once optical disc.

According to an embodiment of the present invention, the recording / reproducing apparatus for a multilayer optical information recording medium irradiates each information recording layer of the multilayer optical information recording medium having a plurality of information recording layers with a laser beam to collect the information. A light irradiating means for recording and reproducing data of the information recording layer, a recommended recording power previously recorded in the disc management area for reading only on the multilayer information recording medium at the time of disc creation, and an OPC which can be additionally written or rewritten. Management information reading means for reading out the area management information, and recording power control means for controlling the laser power of the laser light applied to each information recording layer of the multilayer optical information recording medium and performing test recording with a plurality of recording powers Reproduction signal detection means for detecting the signal quality of the reproduction signal obtained from the reflected light from the multilayer optical information recording medium, and the reproduction signal detection The optimum recording power, which is the optimum value of the recording power, is calculated from the detected value of the means, the ratio (α) between the optimum recording power and the recommended recording power is calculated, and the optimum power estimated for an arbitrary information recording layer is calculated. Calculating means for calculating the predicted optimum recording power.

Further, according to an embodiment, the recording / reproducing apparatus holds, in a memory, any one or all of the optimum recording power, the ratio (α), and the predicted optimum power of each information recording layer obtained by the test recording. Holds the memory means.

According to an embodiment, the multilayer optical information recording medium of the present invention is a multilayer optical information recording medium having a plurality of information recording layers, wherein the multilayer optical information recording medium is a first optical information recording medium. An information recording layer, and second to N-th information recording layers (N is provided on the laser light incident side of the first information recording layer) and arranged in order from the side closer to the first information recording layer Each information recording layer comprises an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, the inner zone of each information recording layer, or the In at least one of the outer zones, there are at least two types of test recording areas (first test recording area and second test recording area) for test recording conditions for recording and / or reproducing data. Test record At least one test recording area of the band), the second test recording area, after the test recording on the first test recording area is test recording.

According to an embodiment, in at least two information recording layers of the first to Nth information recording layers, at least a part of the first test recording area is physically substantially the same radius. Overlapping position.

According to an embodiment, the first test recording area is test-recorded in order from the information recording layer far from the laser beam incident side.

In one embodiment, the physical size of the test recording area of the first information recording layer is equal to the physical size of the first test recording area of each of the second to Nth information recording layers. Bigger than that.

According to an embodiment, of the first to Nth information recording layers, at least one information recording layer has both the first test recording area and the second test recording area, The physical size of the second test recording area is larger than the physical size of the first test recording area.

According to an embodiment, a multilayer optical information recording medium having a plurality of information recording layers, the multilayer optical information recording medium comprising: a first information recording layer; and the first information recording layer. The second to Nth information recording layers (N is an integer of 2 or more) provided in order from the side closer to the first information recording layer than the first information recording layer. The information recording layer constitutes an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, and is in at least one of the inner zone and the outer zone of each information recording layer. , Having a test recording area for test recording conditions for recording and / or reproducing data, and at least one of the test recording areas is set with an upper limit value of recording power for test recording .

According to an embodiment, at least one information recording layer of the first to Nth information recording layers includes a read-only management data area formed at the time of disc creation, and performs the test recording. The upper limit value of the recording power is recorded in advance in the management data area and the optimum recording power obtained by test recording in at least one of the first to Nth information recording layers. It is set based on the ratio to the recommended recording power.

According to an embodiment, at least one information recording layer among the first to Nth information recording layers includes a read-only management data area that is formed in advance when a disc is manufactured. Of the Nth information recording layer, at least a part of the test recording area of at least one information recording layer overlaps with the management data area at substantially the same physical radial position.

According to an embodiment, at least one of the first to Nth information recording layers includes a read-only management data area formed at the time of disc creation, and the management data area The upper limit value of the recording power for test recording in the test recording area is recorded in advance.

According to an embodiment, at least one of the first to Nth information recording layers includes a read-only management data area formed at the time of disc creation, and the management data area Inside, the upper limit value of the modulation degree that can be test-recorded in the test recording area or the modulation degree of the recommended recording power is recorded in advance.

Further, according to an embodiment, at least a part of the test recording area overlaps substantially physically the same radial position in at least two of the first to Nth information recording layers. ing.

According to an embodiment, in a method for recording a multilayer optical information recording medium having a plurality of information recording layers, the multilayer optical information recording medium includes a first information recording layer, and the first information The second to Nth information recording layers (N is an integer of 2 or more) provided in the laser beam incident side from the recording layer and sequentially disposed from the side closer to the first information recording layer, Each information recording layer constitutes an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, and is in at least one of the inner zone and the outer zone of each information recording layer In addition, at least one of the test recording areas (first test recording area and second test recording area) that are distinguished into at least two types for test recording conditions for recording and / or reproducing data Having a test recording area of the kind. The recording method includes a step of performing test recording in the first test recording area of an i-th (i is an integer from 1 to N) information recording layer, and determining a recording power of the i-th information recording layer; test recording in the second test recording area of the i information recording layer, and determining a recording pulse condition of the i th information recording layer.

According to an embodiment, in a method for recording a multilayer optical information recording medium having a plurality of information recording layers, the multilayer optical information recording medium includes a first information recording layer, and the first information The second to Nth information recording layers (N is an integer of 2 or more) provided in the laser beam incident side from the recording layer and sequentially disposed from the side closer to the first information recording layer, Each information recording layer constitutes an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, and is in at least one of the inner zone and the outer zone of each information recording layer In addition, at least one of the test recording areas (first test recording area and second test recording area) that are distinguished into at least two types for test recording conditions for recording and / or reproducing data Having a test recording area of the kind. The recording method includes a step of performing test recording in the first test recording area of an i-th (i is an integer from 1 to N) information recording layer, and determining a recording power of the i-th information recording layer; Test recording is performed in the second test recording area of any one of the information recording layers other than i, where j ≠ i and j is an integer from 1 to N, and the j-th information recording layer Determining the recording power of the layer.

According to an embodiment, at least one of the first to Nth information recording layers is added to a read-only management data area (control data area) previously formed at the time of disc creation or A rewritable management data area (DMA) is further provided. The recording method of the multilayer optical information recording medium includes a step of reading a recommended power previously recorded at the time of disc creation from the control data area, a step of reading test recording area management information from the DMA, and the test recording area management information Determining that the first test recording area that can be recorded is the i-th (i is an integer from 1 to N) information recording layer, and the first test recording area of the i-th information recording layer Performing test recording, determining an optimum recording power of the i-th information recording layer, calculating a ratio (α) of the optimum power and the recommended recording power of the i-th information recording layer, A predicted optimum recording power that is an estimated optimum power of the information recording layer is calculated, and the second test recording of the information recording layers other than the i-th information recording layer is calculated from the predicted optimum recording power. A step of calculating an upper limit value of recording power when performing test recording in the area, and information on any one of the information recording layers other than the i-th information (j ≠ i and j is an integer from 1 to N) Test recording is performed in the second test recording area of the recording layer with a recording power equal to or lower than the upper limit value, and the optimum power of the jth information recording layer is determined.

Further, according to an embodiment, the second test recording area is tested after test recording in the first test recording area of any one of the first to Nth information recording layers. Record.

According to an embodiment, the optimum recording power obtained in the first test recording area of the i-th information recording layer which is at least one information recording layer among the first to N-th information recording layers, From the calculated value obtained by calculating the ratio (α) with the recommended recording power recorded in advance in the management data area, the following formula (1)
Predicted optimal power of the j-th layer = α × recommended recording power of the j-th layer × X (1)
Based on the calculated value, the upper limit value of the second test recording area is set.

Also, according to an embodiment, the X is 1.1.

Further, according to an embodiment, the test recording order of the first test recording areas arranged in each information recording layer is the order of the laser incident light in the recordable first test recording area. Recording is sequentially performed from a layer located on the far side to a layer located near the laser incident light.

According to an embodiment, the order of test recording between the layers of the second test recording area arranged in each information recording layer is that the recordable second test recording areas are recorded in an arbitrary order. Is possible.

According to an embodiment, in a reproducing method of a multilayer optical information recording medium having a plurality of information recording layers, the multilayer optical information recording medium includes a first information recording layer, and the first information The second to Nth information recording layers (N is an integer of 2 or more) provided in the laser beam incident side from the recording layer and sequentially disposed from the side closer to the first information recording layer, Each information recording layer constitutes an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, and is in at least one of the inner zone and the outer zone of each information recording layer In addition, at least one of the test recording areas (first test recording area and second test recording area) that are distinguished into at least two types for test recording conditions for recording and / or reproducing data Has a test recording area of the class, write-once or rewritable management data area (DMA). The reproducing method includes a step of performing test recording in the first test recording area of the i-th (i is an integer from 1 to N) information recording layer and determining a recording power of the i-th information recording layer; performing test recording in the second test recording area of the i information recording layer and determining a recording pulse condition of the i th information recording layer; and the first test recording area of the i th information recording layer Or the step of writing in the second test recording area or the management data area (DMA) and the recording track on which the writing has been performed are reproduced under a plurality of servo conditions to check the quality of the reproduction signal. And adjusting the servo condition from the quality of the reproduction signal.

According to an embodiment, in a reproducing method of a multilayer optical information recording medium having a plurality of information recording layers, the multilayer optical information recording medium includes a first information recording layer, and the first information The second to Nth information recording layers (N is an integer of 2 or more) provided in the laser beam incident side from the recording layer and sequentially disposed from the side closer to the first information recording layer, Each information recording layer constitutes an inner zone, a data zone, and an outer zone in order from the inner periphery according to the radial position, and is in at least one of the inner zone and the outer zone of each information recording layer In addition, at least one of the test recording areas (first test recording area and second test recording area) that are distinguished into at least two types for test recording conditions for recording and / or reproducing data Has a test recording area of the class, write-once or rewritable management data area (DMA). The reproducing method includes a step of performing test recording in the first test recording area of the i-th (i is an integer from 1 to N) information recording layer and determining a recording power of the i-th information recording layer; Test recording is performed on the second test recording area of any one of the information recording layers other than i, where j ≠ i and j is an integer from 1 to N, and the jth information Determining a recording power of the recording layer, performing test recording in the second test recording area of the j-th information recording layer, and determining a recording pulse condition of the j-th information recording layer; writing to the information recording layer of i, or the first test recording area or the second test recording area or the management data area (DMA) of the j-th information recording layer, and a plurality of servo conditions Recording track on which the writing has been performed. Comprising the steps of: reproducing the click to check the quality of the reproduced signal, the step of adjusting the servo conditions from the quality of the reproduced signal.

According to an embodiment, a recording / reproducing apparatus for a multilayer optical information recording medium irradiates and collects a laser beam on each information recording layer of the multilayer optical information recording medium having a plurality of information recording layers to collect the information. Light irradiating means for recording and reproducing information recording layer data, recommended recording power prerecorded at the time of disc creation in the read-only disc management area on the multilayer information recording medium, and test recording area management that can be additionally written or rewritten Management information reading means for reading information, recording power control means for controlling the laser power of the laser light irradiated to each information recording layer of the multilayer optical information recording medium and performing test recording with a plurality of recording powers, Reproduction signal detection means for detecting the signal quality of the reproduction signal obtained from the reflected light from the multilayer optical information recording medium; and The optimum recording power which is the optimum value of the recording power is calculated from the output value, the ratio (α) of the optimum recording power and the recommended recording power is calculated, and the optimum power estimated for an arbitrary information recording layer is obtained. Computing means for calculating the predicted optimum recording power.

INDUSTRIAL APPLICABILITY The optical recording / reproducing method and the optical recording / reproducing apparatus for the optical disk medium of the present invention have the effect of high-density recording on the optical recording medium, and can be used in the electric appliance industry including digital home appliances and information processing apparatuses. .

DESCRIPTION OF SYMBOLS 101 Multilayer optical disk 102 Diffraction element 103 Collimating lens 105 Objective lens 106 Laser light source 107 Actuator 108 Spherical aberration correction part 109 Photodetector 111 Optical pick-up 112 Servo control part 113 RF signal calculation part 114 Laser drive circuit 115 Laser output control circuit 116 Recording power Control unit 117 Reproduction signal detection unit 118 Management information reading unit 119 Calculation unit 120 Memory 121 System control unit 122 Spindle motor

Claims

An information recording medium having a plurality of information recording layers of three or more layers,
Each of the plurality of information recording layers includes a test recording area used for adjusting recording conditions,
One information recording layer of the plurality of information recording layers includes a read-only management data area in which management data for managing the information recording medium is recorded in advance.
Each of the other two or more information recording layers of the plurality of information recording layers includes the test recording area having a radial position overlapping a part of the management data area.
A playback device for playing back information recorded on the information recording medium according to claim 1,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 1,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that adjusts the recording condition using the test recording area, and records information on the information recording medium under the adjusted recording condition.
An information recording medium having a plurality of information recording layers of three or more layers,
One information recording layer of the plurality of information recording layers includes a read-only management data area in which management data for managing the information recording medium is recorded in advance.
Each of the other two or more information recording layers of the plurality of information recording layers has a write prohibited area where writing is prohibited, at least a part of which overlaps with the reproduction-only management data area. An information recording medium provided.
A playback device for playing back information recorded on the information recording medium according to claim 4,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording device for recording information on the information recording medium according to claim 4,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that reproduces the management data recorded in advance in the reproduction-only management data area and records information on the information recording medium based on the management data.
An information recording medium having a plurality of information recording layers of three or more layers,
Each of the plurality of information recording layers includes a test recording area used for adjusting recording conditions,
One information recording layer of the plurality of information recording layers is:
A recordable management data area capable of newly writing management data for managing the information recording medium, and a test recording area,
The recordable management data area is an information recording medium arranged on an inner circumference side and an outer circumference side of the test recording area.
A playback device for playing back information recorded on the information recording medium according to claim 7,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 7,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that adjusts the recording condition using the test recording area, and records information on the information recording medium under the adjusted recording condition.
An information recording medium having a plurality of information recording layers of three or more layers,
At least two information recording layers of the plurality of information recording layers include a recordable management data area into which management data for managing the information recording medium can be newly written,
The recordable management data area of one information recording layer of the plurality of information recording layers and the recordable management data area of at least one other information recording layer have at least some radial positions. Information recording media that overlap each other.
A playback device for playing back information recorded on the information recording medium according to claim 10,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 10,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that reproduces the management data recorded in the recordable management data area and records information on the information recording medium based on the management data.
An information recording medium having a plurality of information recording layers of three or more layers,
One information recording layer of the plurality of information recording layers is provided with a plurality of recordable management data areas into which management data for managing the information recording medium can be newly written.
A playback device for playing back information recorded on the information recording medium according to claim 13,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 13,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that reproduces the management data recorded in the recordable management data area and records information on the information recording medium based on the management data.
An information recording medium having a plurality of information recording layers of three or more layers,
One information recording layer of the plurality of information recording layers includes a plurality of recordable management data areas into which management data for managing the information recording medium can be newly written,
An information recording medium in which a test recording area used for adjusting a recording condition is arranged between the two recordable management data areas.
A playback device for playing back information recorded on the information recording medium according to claim 16,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording device for recording information on the information recording medium according to claim 16,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that adjusts the recording condition using the test recording area, and records information on the information recording medium under the adjusted recording condition.
An information recording medium having a plurality of information recording layers of three or more layers,
One information recording layer of the plurality of information recording layers is:
A test recording area used to adjust the recording conditions;
A first write-inhibited area, which is disposed adjacent to the inner periphery side of the test recording area and in which writing is prohibited;
A second write-inhibited area, which is disposed adjacent to the outer peripheral side of the test recording area and in which writing is prohibited,
A first region disposed adjacent to an inner peripheral side of the first write prohibited region;
A second region disposed adjacent to the outer peripheral side of the second write-protection region,
An information recording medium in which information having the same attribute is recorded in the first area and the second area.
A playback device for playing back information recorded on the information recording medium according to claim 19,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 19,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that adjusts the recording condition using the test recording area, and records information on the information recording medium under the adjusted recording condition.
An information recording medium having a plurality of information recording layers of three or more layers,
Each of at least one information recording layer of the plurality of information recording layers includes first and second test recording areas used for adjusting recording conditions,
In the first test recording area, a first test recording is performed,
After the first test recording, a second test recording based on a result of the first test recording is performed in the second test recording area,
The information recording medium, wherein a physical size of the second test recording area is larger than a physical size of the first test recording area.
Each of at least two information recording layers of the plurality of information recording layers includes the first and second test recording areas,
23. The information recording medium according to claim 22, wherein the test recording using the first test recording area is sequentially performed from an information recording layer far from a laser light incident surface of the information recording medium.
A playback device for playing back information recorded on an information recording medium according to claim 22,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A light receiving unit for receiving reflected light of the irradiated laser beam;
And a reproducing unit that reproduces information based on the signal obtained by the light reception.
A recording apparatus for recording information on the information recording medium according to claim 22,
An irradiation unit for irradiating the plurality of information recording layers with laser light;
A recording apparatus comprising: a recording unit that adjusts the recording condition using the first and second test recording areas, and records information on the information recording medium under the adjusted recording condition.